c program to find sum of array elements using recursion code example

Example 1: c program to find the sum of given number using recursion

# include <stdio.h>
int sum(int number);
int main
{
 int n;
 int a;
 printf("enter a number");
 scanf("%d,&n);
 a=sum(n);
 printf("sum=%d",a);
 }
int sum(int number)
{
  if (number==0)
    return 0;
  return(number%10+sum(number/10);
 }

Example 2: c program to find sum of array elements using recursion

int sum(int arr[], int start, int len)
{
    // Recursion base condition
    if(start >= len)
        return 0;
 
    return (arr[start] + sum(arr, start + 1, len));