To find whether the given number is prime or not

/* To find whether the given number is prime or not */

#include<stdio.h>

#include<conio.h>

void main()

{

  int i,num;

  clrscr();

  printf("Enter the number: ");

  scanf("%d",&num);

  i=2;

  while(i<=num-1)

  {

    if(num%i==0)

    {

      printf("\n%d is NOT a prime number!",num);

      break;

    }

    i++;

  }

  if(i==num)

    printf("%d is a Prime Number!",num);

  getch();

}

 

OUTPUT

Enter the number: 67

67 is a Prime Number!