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C Program to Find whether a Number is Prime or Not using Recursion

C Program to Find whether a Number is Prime or Not using Recursion

The following C program, using recursion, finds whether the entered number is a prime number or not. A prime number is an integer that has no integral factor but itself and 1.

    #include <stdio.h>

    int primeno(int, int);

    int main()

    {

        int j, check;

        printf("Enter a number: ");

        scanf("%d", &j);

        check = primeno(j, j / 2);

        if (check == 1)

        {

            printf("%d is a prime number\n", j);

        }

        else

        {

            printf("%d is not a prime number\n", j);

        }

        return 0;

    }

    int primeno(int j, int x)

    {

        if (x == 1)

        {

            return 1;

        }

        else

        {

           if (j % x == 0)

           {

             return 0;

           }

           else

           {

             return primeno(j, x - 1);

           }       

        }

    }

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