C Exercises: Product of a variable number of integers

C Variadic function: Exercise-2 with Solution

Write a C program to find the product of a variable number of integers passed as arguments to a function using variadic functions.

Sample Solution:

C Code:

#include <stdio.h>

#include <stdarg.h>

int multiply(int count, ...) {
  int result = 1;
  va_list args;
  va_start(args, count);
  for (int i = 0; i < count; i++) {
    int num = va_arg(args, int);
    result *= num;
  }
  va_end(args);
  return result;
}
int main() {
  int p1 = multiply(4, 2, 3, 4, 5);
  int p2 = multiply(3, 5, 10, 15);
  printf("Product of 2, 3, 4, and 5: %d\n", p1);
  printf("Product of 5, 10, and 15: %d\n", p2);
  return 0;
}

Sample Output:

Product of 2, 3, 4, and 5: 120
Product of 5, 10, and 15: 750 

Explanation:

In the above program, the multiply() function takes a variable number of arguments using the ... syntax. The function then initializes a 'va_list' variable args using the 'va_start()' macro and loops through each argument using the 'va_arg()' macro. The function multiplies each argument together to get the final product, which is then returned.

Flowchart:

C Programming Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Sum of a variable number of integers.
Next: Maximum and minimum of a variable number of integers.