Write a C Program to Check Weather a number is Prime or not



Prime Check, Timus Rak, Sumit Kar





/* Using while loop */



#include<stdio.h>

void 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 && a!=1)

        printf("Prime Number");

    else

        printf("Not Prime Number");


}







/* Using for loop */



#include<stdio.h>

void 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 && a!=1)

        printf("Prime Number");

    else

        printf("Not Prime Number");









}


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