C Exercises: Compute the sum of a variable number of integers passed as arguments using an inline function

Last update on August 07 2025 12:48:23 (UTC/GMT +8 hours)

11. Variadic Sum Inline Variants

Write a C program to compute the sum of a variable number of integers passed as arguments using an inline function.

Sample Solution:

C Code:

#include <stdio.h>

#include <stdarg.h>

inline int inline_sum(int count, ...) {
  int sum = 0;
  va_list args;
  va_start(args, count);

  for (int i = 0; i < count; i++) {
    sum += va_arg(args, int);
  }
  va_end(args);
  return sum;
}
int main() {
  int total = inline_sum(5, 1, 2, 3, 4, 5);
  printf("Sum is %d\n", total);

  int total2 = inline_sum(3, 6, 10, -16);
  printf("Sum is %d\n", total2);

  return 0;
}

Sample Output:

Sum is 15
Sum is 0

Explanation:

In the above exercise, the sum function takes a variable number of arguments using the stdarg.h library. It first initializes a va_list object with va_start, then iterates through the arguments in a loop. It adds each one to a running sum. Finally, it cleans up with va_end and returns the sum.

In main(), we call sum twice with different sets of integers and print out the results.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to compute the average of a variable number of integers using an inline variadic function.
Write a C program to calculate both the sum and product of a variable number of integers using an inline function.
Write a C program to sum the squares of a variable number of integers using an inline variadic function.
Write a C program to compute the cumulative sum from a variable number of integers passed as arguments using an inline function.

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