To check whether the Given Number is Prime or not using while loop

 Program:

#include<stdio.h>

#include<conio.h>

void main()

{

    int n, i=1, count=0;

    clrscr();

    printf("Enter any Number : ");

    scanf("%d", &n);

    while(i<=n)

    {

        if(n%i==0)

            count++;

        i++;

    }

    if(count==2)

        printf("Given Number is Prime");

    else

        printf("Given Number is nor Prime");

    getch();

}

Output:

Ex-1:

Enter any Number : 19

Given Number is Prime

Ex-2:

Enter any Number : 15

Given Number is not Prime

Ex-3:

Enter any Number : 149

Given Number is Prime

Ex-1:

Enter any Number : 133

Given Number is not Prime

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