C programming: When running the code, why did the output turn 55?  int sum(int k); int main() {   int result = sum(10);   printf("%d", result);   return 0; } int sum(int k) {   if (k > 0) {     return k + sum(k - 1);   } else {     return 0;   } }

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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C programming: When running the code, why did the output turn 55? 

int sum(int k);

int main() {
  int result = sum(10);
  printf("%d", result);
  return 0;
}

int sum(int k) {
  if (k > 0) {
    return k + sum(k - 1);
  } else {
    return 0;
  }
}

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