Prime number

C program to find number is prime or not :

code

  #include<stdio.h>

#include<conio.h>

   void main()

{

  int num, i, flag = 0;

    clrscr();

   printf(‘\nEnter a  number :”);

   scanf(“%d”,&num);

   for(i=2;i<=num/2;i++)

{

if(num % i==0)

{

flag=1;

break;

}

}

if(flag == 0)

{

printf(“\n%d is a prime number “,num);

}

else

{

printf(“\n%d is not prime number”,num);

}

 

   getch();

 

}


 

output

Enter a number :

6

6 is not prime number

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