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Q. Write a C program to find whether a number is prime or not.

A prime number is one,which is divisible only by one or itself. And its must greater than 1.

Ans.

#include<stdio.h>

#include<stdio.h>

int main()

{

 int x,num;

 printf("Enter number : ");

 scanf("%d",&num);

 x=2;

 while(x<=num-1)

 {

   if(num%x==0)

   {

      printf("Number is not prime!!");

      break;

   }

   x++;

 }

 if(x==num)

    printf("Number is prime!!");

 getch();

 return 0;

}

Output:

Enter number : 7

It is prime!!