C Exercises: Product of a variable number of integers

Last update on August 07 2025 12:52:17 (UTC/GMT +8 hours)

2. Variadic Product Function Challenges

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:

For more Practice: Solve these Related Problems:

• Write a C program to compute the product of a variable number of integers using a variadic function with a count parameter.
• Write a C program to implement a variadic product function that handles both positive and negative numbers correctly.
• Write a C program to recursively calculate the product of integers passed as variadic arguments and detect potential overflow.
• Write a C program to compute the product and also return the logarithm of the product for a variable number of integers using a variadic function.

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