Prime number program in c using while loop

Prime number program in c using while loop:

 Prime number program in c using while loop:

#include<stdio.h>

int main()

{

    int i,j,k;

    printf("Enter a number: ");

    scanf("%d",&i);

    k=0;

    j=2;

    while(j <= i/2)

    {

        if(i%j == 0)

        {

            k=1;

            break;

        }

        j++;

    }

    if(k==0)

        printf("The entered number is Prime Number.");

    else

        printf("Entered number is Not Prime Number.");

    return 0;

}

Output:

Enter a number: 7

The entered number is Prime Number.

Explanation of the above program: 

1. If the while loop condition (j <= i/2) is true then loop enters into while loop and check the if condition (i%j == 0). 
2. If the condition is true the Entered number is not the prime number. 
3. If the condition is False, then the number entered is the Prime number.

Read also: 

• Prime number program in c using if-else
• C if else

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