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why output is 0 here. i am a newbie (20 days experience)

*i want to copy inputed array in sum_of_elements function as argument and then sum all the elements of array, but i am getting output 0.

#include <stdio.h>

int i, num, sum;
int sum_of_elements(int arr[]) {
  for (i = 0; i < num; i++) {
    for (i = 0; sum = 0, i < num; i++) {
      sum += arr[i];
    }
    return sum;
  }
}
int main() {
  printf("enter number of digits you want to add\n");
  scanf("%d", & num);

  int arr[num];

  for (i = 0; i < num; i++) {
    printf("enter number %d\n", i + 1);
    scanf("%d", & arr[i]);
  }
  int total = sum_of_elements(arr);
  printf("%d", total);

  return 0;
Solution

  • Look at this line of code:

    for (i = 0; sum = 0, i < num; i++) {

    This resets sum to 0 every loop.

    It should be

    for (i = 0, sum = 0; i < num; i++) {

    But it's probably better to do this:

    sum = 0;
for (i = 0; i < num; i++) {