Let us c Q.

CH-5J(b).c

/* using recursion*/
#include <stdio.h>

void prime(int);
int main()
{
    int num;
    printf(" Enter a number ");
    scanf("%d", &num);
    prime(num);
}

void prime(int num)
{
    for (int a = 2; a <= num; a++)
    {
        if (num % a == 0)
        {
            printf("%d,", a);
            prime(num / a);
            break;
        }
    }
}