Get factor of number using C- find a prime factor

Get factor of number using C programming language, check if a number is prime or composite.
cpp code

void factor(int number, int n, int j) {
// Define integer
int   i;

// 1 is not a prime number 
if (n == 1) {

   printf("1 is a unit\n");
   return;

}

 

i = j;

while (i <= (int)(sqrt((double)n))) {
   if (n % i == 0) { 
      // print a prime number i and continue search 
      fprintf(stdout, "%d\n", i);
      factor(number, (int)(n / i), i);
      return;

      }

   else {

      i++;

   }

}

// If you got this part means that n is prime number.
if (n == number)
   printf("%d is prime\n", number);
else
   printf("%d\n", n);

return;

}