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Program to find sum of elements in a given array in C++
In this problem, we are given an array arr[] of n integer values. Our task is to create a Program to find sum of elements in a given array in C++.
Program Description − For the given array, we will add up all elements and return the sum.
Let’s take an example to understand the problem
Input
arr[] = {3, 1, 7, 2, 9, 10}Output
32
Explanation
Sum = 3 + 1 + 7 + 2 + 9 + 10 = 32
Solution Approach
To find the sum of elements of the array, we will traverse the array and extract each element of the array and add them to sumVal which will return the sum.
We can do by two ways,
- Using recursion
- Using iteration
Program to show the implement Recursive approach
Example
#include <iostream>
using namespace std;
int calcArraySum(int arr[], int n){
if(n == 1){
return arr[n-1];
}
return arr[n-1] + calcArraySum(arr, n-1);
}
int main(){
int arr[] = {1, 4, 5, 7, 6};
int n = sizeof(arr)/ sizeof(arr[0]);
cout<<"The sum of elements in a given array is"<<calcArraySum(arr, n);
return 0;
}Output
The sum of elements in a given array is 23
Program to show the implement Iterative approach
Example
#include <iostream>
using namespace std;
int calcArraySum(int arr[], int n){
int sumVal = 0;
for(int i = 0; i < n; i++){
sumVal += arr[i];
}
return sumVal;
}
int main(){
int arr[] = {1, 4, 5, 7, 6};
int n = sizeof(arr)/ sizeof(arr[0]);
cout<<"The sum of elements in a given array is"<<calcArraySum(arr, n);
return 0;
}Output
The sum of elements in a given array is 23
Updated on: 16-Sep-2020
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