Prime Number

Welcome to the World of Online Learning:

Hello Friends “This blog helps you to learn C programming concepts. You can learn C language at your own speed and time. One can learn concepts of C language by practicing various programs given on various pages of this blog. Enjoy the power of Self-learning using the Internet.”

Write a C program to Prime Number

PROGRAM: Prime Number

/* Prime Number using while loop */

#include<stdio.h>
int main()
{
    int a,i,f;
    printf("Enter a number: ");
    scanf("%d",&a);
    f=0;
    i=2;
    while(i <= a/2)
    {
        if(a%i == 0)
        {
            f=1;
            break;
        }
        i++;
    }
    if(f==0)
        printf("Prime Number")
    else
        printf("Not Prime Number");
 return 0;
}

-------------------------------------------------------

/* Prime number using for loop */

#include<stdio.h>
int main()
{
    int a,i,f;
    printf("Enter a number: ");
    scanf("%d",&a);
    f=0;
    for(i=2;i <= a/2;i++)
    {
        if(a%i == 0)
        {
            f=1;
            break;
         }
    }
    if(f==0)
        printf("Prime Number")
    else
        printf("Not Prime Number");
 return 0;
}