Tic tac toe game in C

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include <windows.h>



int board[10] = {2,2,2,2,2,2,2,2,2,2};
int turn = 1,flag = 0;
int player,comp;

void menu();
void go(int n);
void start_game();
void check_draw();
void draw_board();
void player_first();
void put_X_O(char ch,int pos);
 COORD coord={0,0}; // this is global variable
                                    //center of axis is set to the top left cornor of the screen
void gotoxy(int x,int y)
{
    coord.X=x;
    coord.Y=y;
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE),coord);
}



 void main()
{
 system("cls");
 menu();
 getch();

}

void menu()
{
 int choice;
 system("cls");
 printf("\n--------MENU--------");
 printf("\n1 : Play with X");
 printf("\n2 : Play with O");
 printf("\n3 : Exit");
 printf("\nEnter your choice:>");
 scanf("%d",&choice);
 turn = 1;
 switch (choice)
 {
  case 1:
   player = 1;
   comp = 0;
   player_first();
   break;
  case 2:
   player = 0;
   comp = 1;
   start_game();
   break;
  case 3:
   exit(1);
  default:
   menu();
 }
}

int make2()
{
 if(board[5] == 2)
  return 5;
 if(board[2] == 2)
  return 2;
 if(board[4] == 2)
  return 4;
 if(board[6] == 2)
  return 6;
 if(board[8] == 2)
  return 8;
 return 0;
}

int make4()
{
 if(board[1] == 2)
  return 1;
 if(board[3] == 2)
  return 3;
 if(board[7] == 2)
  return 7;
 if(board[9] == 2)
  return 9;
 return 0;
}

int posswin(int p)
{
// p==1 then X   p==0  then  O
 int i;
 int check_val,pos;

 if(p == 1)
  check_val = 18;
 else
  check_val = 50;

 i = 1;
 while(i<=9)//row check
 {
  if(board[i] * board[i+1] * board[i+2] == check_val)
  {
   if(board[i] == 2)
    return i;
   if(board[i+1] == 2)
    return i+1;
   if(board[i+2] == 2)
    return i+2;
  }
  i+=3;
 }

 i = 1;
 while(i<=3)//column check
 {
  if(board[i] * board[i+3] * board[i+6] == check_val)
  {
   if(board[i] == 2)
    return i;
   if(board[i+3] == 2)
    return i+3;
   if(board[i+6] == 2)
    return i+6;
  }
  i++;
 }

 if(board[1] * board[5] * board[9] == check_val)
 {
  if(board[1] == 2)
   return 1;
  if(board[5] == 2)
   return 5;
  if(board[9] == 2)
   return 9;
 }

 if(board[3] * board[5] * board[7] == check_val)
 {
  if(board[3] == 2)
   return 3;
  if(board[5] == 2)
   return 5;
  if(board[7] == 2)
   return 7;
 }
 return 0;
}

void go(int n)
{
 if(turn % 2)
  board[n] = 3;
 else
  board[n] = 5;
 turn++;
}

void player_first()
{
 int pos;

 check_draw();
 draw_board();
 gotoxy(30,18);
 printf("Your Turn :> ");
 scanf("%d",&pos);

 if(board[pos] != 2)
  player_first();

 if(pos == posswin(player))
 {
  go(pos);
  draw_board();
  gotoxy(30,20);
  //textcolor(128+RED);
  printf("Player Wins");
  getch();
  exit(0);
 }

 go(pos);
 draw_board();
 start_game();
}

void start_game()
{
 // p==1 then X   p==0  then  O
 if(posswin(comp))
 {
  go(posswin(comp));
  flag = 1;
 }
 else
 if(posswin(player))
  go(posswin(player));
 else
 if(make2())
  go(make2());
 else
  go(make4());
 draw_board();

 if(flag)
 {
  gotoxy(30,20);
  //textcolor(128+RED);
  printf("Computer wins");
  getch();
 }
 else
  player_first();
}

void check_draw()
{
 if(turn > 9)
 {
  gotoxy(30,20);
  //textcolor(128+RED);
  printf("Game Draw");
  getch();
  exit(0);
 }
}

void draw_board()
{
 int j;

 for(j=9;j<17;j++)
 {
  gotoxy(35,j);
  printf("|       |");
 }
 gotoxy(28,11);
 printf("-----------------------");
 gotoxy(28,14);
 printf("-----------------------");

 for(j=1;j<10;j++)
 {
  if(board[j] == 3)
   put_X_O('X',j);
  else
  if(board[j] == 5)
   put_X_O('O',j);
 }
}

void put_X_O(char ch,int pos)
{
 int m;
 int x = 31, y = 10;

 m = pos;

 if(m > 3)
 {
  while(m > 3)
  {
   y += 3;
   m -= 3;
  }
 }
 if(pos % 3 == 0)
  x += 16;
 else
 {
  pos %= 3;
  pos--;
  while(pos)
  {
   x+=8;
   pos--;
  }
 }
 gotoxy(x,y);
 printf("%c",ch);
}

Read More

Simple quiz in C

#include<stdio.h>
#include<conio.h>
#include <windows.h>
#include<ctype.h>
#include<stdlib.h>
#include<time.h>
#include<dos.h>

void displayscore()
 {
 char name[20];
 float s;
 FILE *f;
 system("cls");
 f=fopen("score.txt","r");
 fscanf(f,"%s%f",&name,&s);
 printf("\n\n\t\t ");
 printf("\n\n\t\t %s has secured the Highest Score %.2f",name,s);
 printf("\n\n\t\t ");
 fclose(f);
 getch();
 }



void help()
 {
 system("cls");
 printf("\n\n\n\tThis game is very easy to play. You'll be asked some general");
 printf("\n\n\tknowledge questions and the right answer is to be chosen among");
 printf("\n\n\tthe four options provided. Your score will be calculated at the");
 printf("\n\n\tend. Remember that the more quicker you give answer the more");
 printf("\n\n\tscore you will secure. Your score will be calculated and displayed");
 printf("\n\n\tat the end and displayed. If you secure highest score, your score");
 printf("\n\n\twill be recorded. So BEST OF LUCK.");
 }
void writescore(float score, char plnm[20])
 {
 float sc;
 char nm[20];
 FILE *f;
 system("cls");
 f=fopen("score.txt","r");
 fscanf(f,"%s%f",&nm,&sc);
 if (score>=sc)
   { sc=score;
     fclose(f);
     f=fopen("score.txt","w");
     fprintf(f,"%s\n%.2f",plnm,sc);
     fclose(f);
   }
 }
int main()
     {
     int countq,countr;
     int r,i;
     int pa;int nq[6];int w;
     float score;
     char choice;
     char playername[20];
     time_t initialtime,finaltime;
     system("cls");
     //randomize();
     mainhome:
     system("cls");
     puts("\n\t\t WELCOME TO I.Q. TEST PROGRAM\n\n") ;
     puts("\n\t\t-------------------------------");
     puts("\n\t\t Enter 'S' to start game       ");
     puts("\n\t\t Enter 'V' to view high score  ");
     puts("\n\t\t Enter 'H' for help            ");
     puts("\n\t\t Enter 'Q' to quit             ");
     printf("\n\t\t-------------------------------\n\n\t\t  ");
     choice=toupper(getch());
     if (choice=='V')
 {
 displayscore();
 goto mainhome;
 }
     else if (choice=='Q')
 exit(1);
     else if (choice=='H')
 {
 help();
 getch();
 goto mainhome;
 }
    else if(choice=='S'){
     system("cls");

     printf("\n\n\n\t\t\tEnter your name...");
     printf("\n\t\t\t(only one word)\n\n\t\t\t");
     gets(playername);

     home:
     system("cls");
     initialtime=time(NULL);
     countq=countr=0;
     i=1;
     start:
     srand ( time(NULL) );
     r=rand()%23+1;
     nq[i]=r;
     for (w=0;w<i;w++)
 if (nq[w]==r) goto start;

     switch(r)
  {
  case 1:
  printf("\n\nWhat is the maximum no. of asymptotes of the curve x^4+2x+6=0?");
  printf("\n\nA.4\tB.3\n\nC.none\tD.infinite\n\n");
  countq++;
  if (toupper(getch())=='A')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is A.4");break;}

  case 2:
  printf("\n\n\nHow many points are possible in a compound pendulum about which");
  printf("time period is same?");
  printf("\n\nA.4\tB.2\n\nC.none\tD.infinite\n\n");
  countq++;
  if (toupper(getch())=='A')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         printf("\n\nWrong!!! The correct answer is A.4");
  break;

  case 3:
  printf("\n\n\nWho was the first US President?");
  printf("\n\nA.Richard Nikson\tB.Abraham Linkon\n\nC.John F. Kennedy\tD.George Washington\n\n");
  countq++;
  if (toupper(getch())=='D')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is D.George Washington");break;}


  case 4:
  printf("\n\n\nWho was awarded the 'Man of the Tournament' of ICC WORLD CUP 2007?");
  printf("\n\nA.Glen Magrath\tB.Mahela Jawardan\n\nC.Mathew Hayden\tD.Sachin Tendulkar\n\n");
  countq++;
  if (toupper(getch())=='A')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is A.Glen Magrath");break;}


  case 5:
  printf("\n\n\nWhich country won the Fifa World Cup 1998?");
  printf("\n\nA.France\tB.Brazil\n\nC.Italy\tD.England\n\n");
  countq++;
  if (toupper(getch())=='A')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is A.France");break;}

  case 6:
  printf("\n\n\nWhich syllabe is stressed in the word 'democracy'?");
  printf("\n\nA.1st\tB.2nd\n\nC.3rd\tD.4th\n\n");
  countq++;
  if (toupper(getch())=='B' )
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is B.2nd");break;}


  case 7:
  printf("\n\n\nWhich country was the winner of Cricket World Cup 1987?");
  printf("\n\nA.West Indies\tB.India\n\nC.Australia\tD.England\n\n");
  countq++;
  if (toupper(getch())=='C')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is C.Australia");break;}


  case 8:
  printf("\n\n\nWhat is the height of Mount everest in feet?");
  printf("\n\nA.8648\tB.6648\n\nC.8884\tD.8848\n\n");
  countq++;
  if (toupper(getch())=='D')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is D.8848");break;}


  case 9:
  printf("\n\n\nWhat is the capital of Denmark?");
  printf("\n\nA.Copenhagen\tB.Helsinki\n\nC.Rome\t\tD.Madrid\n\n");
  countq++;
  if (toupper(getch())=='A')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is A.Copenhagen");break;}


  case 10:
  printf("\n\n\nWhich syllabe is stressed in the word 'instanteneous'?");
  printf("\n\nA.1st\tB.2nd\n\nC.3rd\tD.4th\n\n");
  countq++;
  if (toupper(getch())=='C')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is C.3rd");break;}


  case 11:
  printf("\n\n\nWho was the only player to score 6 successive sixes in an over?");
  printf("\n\nA.Adam Gilchrist\tB.M.S.Dhoni\n\nC.Herschel Gibbs\tD.Sanath Jayasurya\n\n");
  countq++;
  if (toupper(getch())=='C')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is C.Herschel Gibbs");break;}

  case 12:
  printf("\n\n\nWho was the only player to take 4 successive wickets?");
  printf("\n\nA.Malinga Bandara\tB.Lasith Malinga\n\nC.Bret Lee\tD.Murali Daran\n\n");
  countq++;
  if (toupper(getch())=='B')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is B.Lasith Malinga");break;}

  case 13:
  printf("\n\n\nWhich country is hosting the Fifa World Cup 2010?");
  printf("\n\nA.South Africa\tB.Italy\n\nC.Argentina\tD.Spain\n\n");
  countq++;
  if (toupper(getch())=='A')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is A.South Africa");break;}

  case 14:
  printf("\n\n\nWho is the author of 'Pulpasa Cafe'?");
  printf("\n\nA.Narayan Wagle\tB.Lal Gopal Subedi\n\nC.B.P. Koirala\tD.Khagendra Sangraula\n\n");
  countq++;
  if (toupper(getch())=='A')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is A.Narayan Wagle");break;}

  case 15:
  printf("\n\n\nWhich country is Maria Sarapova from?");
  printf("\n\nA.Russia\tB.Switzerland\n\nC.Argentina\tD.Spain\n\n");
  countq++;
  if (toupper(getch())=='A')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is A.Russia");break;}

  case 16:
  printf("\n\n\nWho was awarded the youngest player award in Fifa World Cup 2006?");
  printf("\n\nA.Wayne Rooney\tB.Lucas Podolski\n\nC.Lionel Messi\tD.Christiano Ronaldo\n\n");
  countq++;
  if (toupper(getch())=='B')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is B.Lucas Podolski");break;}


  case 17:
  printf("\n\n\nWhat is the smallest district of Nepal?");
  printf("\n\nA.Lalitpur\tB.Karnali\n\nC.Bhaktapur\tD.Gulmi\n\n");
  countq++;
  if (toupper(getch())=='C')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is C.Bhaktapur");break;}

  case 18:
  printf("\n\n\nWhat is the headquarter of Western Development Region?");
  printf("\n\nA.Dhankuta\tB.Kathmandu\n\nC.Dhangadhi\tD.Pokhara\n\n");
  countq++;
  if (toupper(getch())=='D')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is D.Pokhara");break;}

  case 19:
  printf("\n\n\nWhich place is called 'The Cherrapunji of Nepal'?");
  printf("\n\nA.Dharan\tB.Kathmandu\n\nC.Pokhara\tD.Butwal\n\n");
  countq++;
  if (toupper(getch())=='C')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is C.Pokhara");break;}

  case 20:
  printf("\n\n\nWhich city is known at 'The City of Seven Hills'?");
  printf("\n\nA.Rome\tB.Vactican City\n\nC.Madrid\tD.Berlin\n\n");
  countq++;
  if (toupper(getch())=='A')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is A.Rome");break;}

  case 21:
  printf("\n\n\nWho was the F1 racing champion of 2006?");
  printf("\n\nA.Louis Hamilton\tB.Felipe Massa\n\nC.Fernando Alonso\tD.Michael Schumaker\n\n");
  countq++;
  if (toupper(getch())=='C')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is C.Fernanda Alonso");break;}

  case 22:
  printf("\n\n\nWho won the Women Australian Open 2007?");
  printf("\n\nA.Martina Hingis\tB.Maria Sarapova\n\nC.Kim Clijster\tD.Serena Williams\n\n");
  countq++;
  if (toupper(getch())=='D')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is D.Serena Williams");break;}

  case 23:
  printf("\n\n\nName the country where there no mosquito is found?");
  printf("\n\nA.Germany\tB.Spain\n\nC.Japan\tD.France\n\n");
  countq++;
  if (toupper(getch())=='D')
   {printf("\n\nCorrect!!!");countr++; break;}
  else
         {printf("\n\nWrong!!! The correct answer is D.France");break;}



  }
 i++;
 if (i<=5) goto start;
 finaltime=time(NULL);
 score=(float)countr/countq*100-difftime(finaltime,initialtime)/3;
 if (score<0) score=0;
 printf("\n\n\nYour Score: %.2f",score);
 if (score==100) printf("\n\nEXCELLENT!!! KEEP IT UP");
 else if (score>=80 && score<100) printf("\n\nVERY GOOD!!");
 else if (score>=60 &&score<80) printf("\n\nGOOD! BUT YOU NEED TO KNOW MORE.");
 else if (score>=40 && score<60) printf("\n\nSATISFACTORY RESULT, BUT THIS MUCH IS MUCH SUFFICIENT.");
 else printf("\n\nYOU ARE VERY POOR IN G.K.,WORK HARD");
 puts("\n\nNEXT PLAY?(Y/N)");
 if (toupper(getch())=='Y')
  goto home;
 else
  {
  writescore(score,playername);
  goto mainhome;
  }
 }
     else
 {
 printf("\n\n\t\t  Enter the right key\n\n\t\t  ");
 Sleep(700);
 goto mainhome;
 }
 return 0;
}

Read More

Graphics in C

#include <windows.h>
#include <stdio.h>
void SetColorAndBackground(int ForgC, int BackC);
void main()
{
    int f,b;

        system("cls");
        printf("Enter fore and background color code : ");
        scanf("%d",&f);
        SetColorAndBackground(f,16);   //color value range 0 up-to 256
        printf("what is text background color");
        SetColorAndBackground(30,256);
        printf("\nCOLOR IN CODE BLOCKS...");
        getch();


}
void SetColorAndBackground(int ForgC, int BackC)
{
     WORD wColor = ((BackC & 0x0F) << 4) + (ForgC & 0x0F);;
     SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), wColor);
}

Read More

Check if a string is palindrome or not in C ?

#include<stdio.h>
#include<string.h>
void main()
{
    char word[50];
    int i,j,l,c=0;
    printf("Enter a word : ");
    gets(word);
    l=strlen(word);
    for(i=0,j=l-1;i<l/2;i++,j--)
    {
        if(word[i]-word[j]>0)
        {
            c=1;
            break;
        }
    }
    if(c==0)
    {
        printf("Palindrome");
    }
    else
    {
        printf("Not palindrome");
    }
    getch();
}

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Check if 3rd digit of a no. is prime or not in C ?

#include<stdio.h>
int digitcount(int x)
{
    int r,c=0,i=0,y=x;
    while(x!=0)
    {
        r=x%10;
        x=x/10;
        c++;
    }
    while(y!=0)
    {
        r=y%10;
        y=y/10;
        i++;
        if(i==c-2)
        {
            return r;
        }
    }
}
void primecheck(int p)
{
    int count=0,j;
    for(j=1;j<=p;j++)
    {
        if(p%j==0)
        {
            count++;
        }
    }
    if(count==2)
    {
        printf("3rd digit i.e. %d is prime.",p);
    }
    else
    {
        printf("3rd digit i.e. %d is not prime.",p);
    }
}
void main()
{
    int n,digino;
    printf("Enter the number  : ");
    scanf("%d",&n);
    digino=digitcount(n);
    primecheck(digino);
    getch();
}

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Application of struct in C

#include<stdio.h>
#include<string.h>
struct student
{
    char name[20];
    int roll;
};
void main()
{
  struct student s[10],t;
  int i,n,j;
  printf("Enter no. of students : ");
  scanf("%d",&n);
  for(i=0;i<n;i++)
  {
      printf("Enter %dth student's name and roll : ",i+1);
      scanf("%s%d",s[i].name,&s[i].roll);
  }
  for(i=0;i<=n-2;i++)
  {
      for(j=i+1;j<=n-1;j++)
      {
          if(strcmp(s[i].name,s[j].name)>0)
          {
              t=s[i];
              s[i]=s[j];
              s[j]=t;
          }
      }
  }
  printf("\nName sorted in alphabetical order is : ");
  printf("\nName\tRoll No.");
  for(i=0;i<n;i++)
  {
      printf("\n%s\t%d",s[i].name,s[i].roll);
  }
  getch();
}

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Check if a no. is prime or not in C ?

#include<stdio.h>
int testprime(int ,int);
void main()
{
    int n,prime;
    printf("Enter a positive number : ");
    scanf("%d",&n);
    prime=testprime(n,n/2);
    if(prime==1)
        printf("%d is prime number.",n);
    else
        printf("%d is not a prime number.",n);
    getch();
}
int testprime(int num, int i)
{
    if(i==1)
    {
        return 1;
    }
    else
    {
        if(num%i==0)
        {
            return 0;
        }
        else
        {
            testprime(num,i-1);
        }
    }
}

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Find HCF in C

#include<stdio.h>
int hcf(int a,int b,int c)
{
    if(a%c==0 && b%c==0)
    return c;
    hcf(a,b,c-1);
}
void main()
{
    int h,x,y;
    printf("Enter two numbers x and y : ");
    scanf("%d%d",&x,&y);
    if(x>y)
    {
        h=hcf(x,y,y);
    }
    else
    {
        h=hcf(y,x,x);
    }
    printf("The HCF of the entered number is : %d",h);
    getch();
}

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Find fibonacci series in C

#include<stdio.h>
void fibonacci(int);
void main()
{
    int n,first=0,second=1;
    printf("Enter the number of fibonacci series to be printed : ");
    scanf("%d",&n);
    printf("%d\t%d\t",first,second);
    fibonacci(n);
    getch();
}
void fibonacci(int n)
{
    static int first=0,second=1,sum=0;
    if(n-2>0)
    {
        sum=first+second;
        first=second;
        second=sum;
        printf("%d\t",sum);
        fibonacci(n-1);
    }
}

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Find no. of vowels in a string in C

#include<stdio.h>
void strcount(char []);
void main()
{
  char str[50];
  char c;
  while(1)
  {
    printf("enter string\n");
    //gets(str);
    scanf("%s",str);
    strcount(str);

    printf("want to run again? press y/n \n");
    scanf("%s",&c);
    if(c == 'n' || c == 'N')
        break;
  }
}
void strcount(char str[50])
{
int i,j=0;
for (i=0;str[i]!=NULL;i++)
 {
  if( str[i]=='a'||str[i]=='A'||str[i]=='e'||str[i]=='E'||str[i]=='i'||str[i]=='I'||str[i]=='o'||str[i]=='O'||str[i]=='u'||str[i]=='U')
  j++;
 }
 printf("count of vowels in string is %d\n",j);
}

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Find triangular no. in C

#include<stdio.h>
void main()
{
    int n1,n2,i,t;
    printf("Enter two numbers : ");
    scanf("%d%d",&n1,&n2);
    for(i=1;i<=n2;i++)
    {
        t = i*(i+1)/2;
        if(t>=n1 && t<=n2)
        {
            printf("%d ",t);
        }
    }
    getch();
}

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Find highest paid employee in C

#include<stdio.h>
struct emp
{
    char name[50];
    int salary;
};
void main()
{
    int n,i,sum=0,avg;
    struct emp e[20],ls,hs;
    printf("Enter the number of employee : ");
    scanf("%d",&n);
    for(i=0;i<n;i++)
    {
        printf("Enter the name and salary of employees : ");
        scanf("%s%d",e[i].name,&e[i].salary);
        sum = sum + e[i].salary;
    }
    avg = sum/n;
    ls.salary=e[0].salary;
    for(i=1;i<n;i++)
    {
        if(ls.salary>e[i].salary)
        {
            ls=e[i];
        }
    }
    hs.salary=e[0].salary;
    for(i=1;i<n;i++)
    {
        if(hs.salary<e[i].salary)
        {
            hs=e[i];
        }
    }
    printf("\nAVERAGE SALARY = %d",avg);
    printf("\n\nThe highest salary of employee is\nNAME\t\tSALARY");
    printf("\n%s\t\t%d",hs.name,hs.salary);
    printf("\n\nThe lowest salary of employee is\nNAME\t\tSALARY");
    printf("\n%s\t\t%d",ls.name,ls.salary);
    printf("\n\nEMPLOYEE HAVING SALARY ABOVE 15000");
    printf("\nNAME\t\tSALARY");
    for(i=0;i<n;i++)
    {
        if(e[i].salary>15000)
        {
            printf("\n%s\t\t%d",e[i].name,e[i].salary);
        }
    }
    getch();
}

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Operations on complex numbers in C

#include<stdio.h>
struct cmplx
{
    float real;
    float img;
};
struct cmplx add(struct cmplx x, struct cmplx y)
{
    struct cmplx z;
    z.real = x.real + y.real;
    z.img = x.img + y.img;
    return(z);
}
struct cmplx sub(struct cmplx x, struct cmplx y)
{
    struct cmplx z;
    z.real = x.real - y.real;
    z.img = x.img - y.img;
    return(z);
}
struct cmplx mul(struct cmplx x, struct cmplx y)
{
    struct cmplx z;
    z.real = x.real * y.real- x.img * y.img;
    z.img = x.real * y.img + x.img * y.real;
    return(z);
}
struct cmplx div(struct cmplx x, struct cmplx y)
{
    struct cmplx z;
    z.real = (x.real*y.real+x.img*y.img)/(y.real*y.real+y.img*y.img);
    z.img = (y.real*x.img-y.img*x.real)/(y.real*y.real+y.img*y.img);
    return(z);
}
void main()
{
    struct cmplx c1,c2,c3;
    char ch;
    printf("Enter the operator +,-,*,/ : ");
    ch = getchar();
    printf("\nEnter the real part of fist complex number : ");
    scanf("%f",&c1.real);
    printf("\nEnter the imaginary part of fist complex number : ");
    scanf("%f",&c1.img);
    printf("\nEnter the real part of 2nd complex number : ");
    scanf("%f",&c2.real);
    printf("\nEnter the imaginary part of 2nd complex number : ");
    scanf("%f",&c2.img);
    switch(ch)
    {
        case '+':
        {
            c3=add(c1,c2);
            break;
        }
        case '-':
        {
            c3=sub(c1,c2);
            break;
        }
        case '*':
        {
            c3=mul(c1,c2);
            break;
        }
        case '/':
        {
            c3=div(c1,c2);
            break;
        }
        default:
        {
            printf("Invalid operator....\a");
            break;
        }
    }
    printf("\n\nThe result is %f + %fi",c3.real,c3.img);
}

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Arranging numbers in ascending and descending order in C

#include<stdio.h>
void main()
{
    int x[5],i,j,temp;
    for(i=0;i<=4;i++)
    {
        printf("Enter x[%d]th number : ",i);
        scanf("%d",&x[i]);
    }
    for(i=0;i<=5-2;i++)
    {
        for(j=i+1;j<=5-1;j++)
        {
            if(x[i]>x[j])
            {
                temp=x[i];
                x[i]=x[j];
                x[j]=temp;
            }
        }
    }
    printf("\nIn Ascending Order : ");
    for(i=0;i<=4;i++)
    {
        printf("%d  ",x[i]);
    }
    printf("\nIn Descending Order : ");
    for(i=4;i>=0;i--)
    {
        printf("%d  ",x[i]);
    }
    getch();
}

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Find largest and smallest no. in C

#include<stdio.h>
void main()
{
    int x[10],i,j,temp;
    for(i=0;i<=9;i++)
    {
        printf("Enter %dth number : ",i+1);
        scanf("%d",&x[i]);
    }
    for(i=0;i<=8;i++)
    {
        for(j=i+1;j<=9;j++)
        {
           if(x[i]<x[j])
           {
               temp=x[i];
               x[i]=x[j];
               x[j]=temp;
           }
        }
    }
    printf("\nThe largest of 10 entered numbers is %d",x[0]);
    //printf("\nThe smallest of 10 entered numbers is %d",x[9]);
    getch();
}

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Display string after deleting vowels in it in C

#include<stdio.h>
void main()
{
    char str[50],i;
    printf("Enter a string : ");
    gets(str);

    printf("\nAfter deleting vowels :\t");

    for(i=0;str[i]!='\0';i++)
    {
        if(str[i]=='a'||str[i]=='A'||str[i]=='e'||str[i]=='E'||str[i]=='i'||str[i]=='I'||str[i]=='o'||str[i]=='O'||str[i]=='u'||str[i]=='U')
        {
            continue;
        }
        else
        {
            printf("%c",str[i]);
        }
    }
    getch();
}

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Count no. of words in a sentence in C

#include<stdio.h>
void main()
{
    char str[50],i,wordcount=0;
    printf("Enter a line of text : ");
    gets(str);
    for(i=0;str[i]!='\0';i++)
    {
        if(str[i]==32)
        {
           wordcount++;
        }
        if(str[i]==' ' && str[i-1]==' ')
        {
            wordcount--;
        }



    }
    if(str[0]==' ' || str[0]=='\0')
    {
        wordcount=-1;
    }


    printf("\n\nThe number of words in the line of text entered is %d",wordcount+1);
    getch();
}

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Sorting names in C

#include<stdio.h>
//#include<string.h>

void copystring(char txt1[], char txt2[])
{
    int k;
    for(k=0;txt2[k]!='\0';k++)
    {
        txt1[k]=txt2[k];
    }
    txt1[k]='\0';
}

int comparestring(char str1[], char str2[])
{
    int p,difference;
    for(p=0;str1[p]!='\0' || str2[p]!='\0';p++)
    {
        difference=str1[p]-str2[p];
        if(difference!=0)
        {
            break;
        }
    }
    return(difference);
}

void swapstring(char txt1[], char txt2[])
{
    int i,temp[50];
    for(i=0;txt2[i]!='\0';i++)
    {
        temp[i]=txt2[i];
    }
    temp[i]='\0';
    for(i=0;txt1[i]!='\0';i++)
    {
        txt2[i]=txt1[i];
    }
    txt2[i]='\0';
    for(i=0;temp[i]!='\0';i++)
    {
        txt1[i]=temp[i];
    }
    txt1[i]='\0';
}

void main()
{
    char name[25][40],temp[40];
    int n,i,j;

    printf("Enter number of names to be sorted in ascending order : ");
    scanf("%d",&n);

    printf("\nEnter %d names to be sorted : \n",n);
    for(i=0;i<n;i++)
    {
        scanf("%s",name[i]);
    }
    for(i=0;i<=n-2;i++)
    {
        for(j=i+1;j<=n-1;j++)
        {

            if(comparestring(name[i],name[j])>0)
            {
                swapstring(name[i],name[j]);
                //copystring(temp,name[i]);
                //copystring(name[i],name[j]);
                //copystring(name[j],temp);
            }
        }
    }
    printf("\nThe sorted name in ascending order is : \n");
    for(i=0;i<n;i++)
    {
        printf("\n%s",name[i]);
    }
    getch();

}

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Copying string 2 to string 1

#include<stdio.h>
void copystr(char [],char []);
void main()
{
    char str1[50],str2[50];
    printf("Enter 1st string,str1 : ");
    gets(str1);
    printf("\nEnter 2nd string,str2 : ");
    gets(str2);
    copystr(str1,str2);
    printf("\n\nAfter copying str2 in str1\n\nstr1 is %s ",str1);

    getch();
}
void copystr(char txt1[], char txt2[])
{
    int i;
    for(i=0;txt2[i]!='\0';i++)
    {
        txt1[i]=txt2[i];
    }
    txt1[i]='\0';

}

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Concatenation of two string in C

#include<stdio.h>
void catstr(char [],char []);
void main()
{
    char str1[50],str2[50];
    printf("Enter 1st string (str1) :");
    gets(str1);
    printf("\nEnter 2nd string (str2) :");
    gets(str2);
    catstr(str1,str2);
    printf("\n\nAfter concatenating(joining) these strings\n\nFinal string is ");
    puts(str1);
    getch();
}
void catstr(char txt1[], char txt2[])
{
    int i,j;
    for(i=0;txt1[i]!='\0';i++);
    for(j=0;txt2[j]!='\0';j++,i++)
    {
        txt1[i]=txt2[j];
    }
    txt1[i]='\0';

}

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