Program to find sum of elements in a given array

Difficulty Level : Easy
Last Updated : 09 Jun, 2021

Given an array of integers, find sum of its elements.
Examples :

Input : arr[] = {1, 2, 3}
Output : 6
1 + 2 + 3 = 6

Input : arr[] = {15, 12, 13, 10}
Output : 50

C++

/* C++ Program to find sum of elements
in a given array */
#include <bits/stdc++.h>
using namespace std;
 
// function to return sum of elements
// in an array of size n
int sum(int arr[], int n)
{
    int sum = 0; // initialize sum
 
    // Iterate through all elements
    // and add them to sum
    for (int i = 0; i < n; i++)
    sum += arr[i];
 
    return sum;
}
 
// Driver code
int main()
{
    int arr[] = {12, 3, 4, 15};
    int n = sizeof(arr) / sizeof(arr[0]);
    cout << "Sum of given array is " << sum(arr, n);
    return 0;
}
 
// This code is contributed by rathbhupendra

C

/* C Program to find sum of elements
 in a given array */
#include <bits/stdc++.h>
 
// function to return sum of elements
// in an array of size n
int sum(int arr[], int n)
{
    int sum = 0; // initialize sum
 
    // Iterate through all elements
    // and add them to sum
    for (int i = 0; i < n; i++)
    sum += arr[i];
 
    return sum;
}
 
int main()
{
    int arr[] = {12, 3, 4, 15};
    int n = sizeof(arr) / sizeof(arr[0]);
    printf("Sum of given array is %d", sum(arr, n));
    return 0;
}

Java

/* Java Program to find sum of elements in a given array  */
class Test
{
     static int arr[] = {12,3,4,15};
      
     // method for sum of elements in an array
     static int sum()
     {
         int sum = 0; // initialize sum
         int i;
       
         // Iterate through all elements and add them to sum
         for (i = 0; i < arr.length; i++)
            sum +=  arr[i];
       
         return sum;
     }
      
     // Driver method
     public static void main(String[] args)
     {
         System.out.println("Sum of given array is " + sum());
        }
 }

Python3

# Python 3 code to find sum
# of elements in given array
def _sum(arr,n):
     
    # return sum using sum
    # inbuilt sum() function
    return(sum(arr))
 
# driver function
arr=[]
# input values to list
arr = [12, 3, 4, 15]
 
# calculating length of array
n = len(arr)
 
ans = _sum(arr,n)
 
# display sum
print ('Sum of the array is ',ans)
 
# This code is contributed by Himanshu Ranjan

C#

// C# Program to find sum of elements in a
// given array
using System;
 
class GFG {
     
    // method for sum of elements in an array
    static int sum(int []arr, int n)
    {
         
        int sum = 0; // initialize sum
         
        // Iterate through all elements and
        // add them to sum
        for (int i = 0; i < n; i++)
            sum += arr[i];
         
        return sum;
    }
     
    // Driver method
    public static void Main()
    {
         
        int []arr = {12,3,4,15};
        int n = arr.Length;
         
        Console.Write("Sum of given array is "
                               + sum(arr, n));
    }
 
}
 
// This code is contributed by Sam007.

PHP

<?php
// PHP Program to find sum of
// elements in a given array
 
// function to return sum
// of elements in an array
// of size n
function sum( $arr, $n)
{
    // initialize sum
    $sum = 0;
 
    // Iterate through all elements
    // and add them to sum
    for ($i = 0; $i < $n; $i++)
    $sum += $arr[$i];
 
    return $sum;
}
 
// Driver Code
$arr =array(12, 3, 4, 15);
$n = sizeof($arr);
echo "Sum of given array is ",
                sum($arr, $n);
 
// This code is contributed by aj_36
?>

Javascript

<script>
//JavaScript Program to find
//sum of elements in a given array
 
    // function to return sum of elements 
    // in an array of size n 
    function sum(arr) { 
        let sum = 0; // initialize sum 
   
        // Iterate through all elements 
        // and add them to sum 
        for (let i = 0; i < arr.length; i++) 
            sum += arr[i]; 
   
        return sum; 
    } 
     
    // Driver code
    let arr = [12, 3, 4, 15];
    document.write("Sum of given array is " + sum(arr));
     
 // This code is contributed by Surbhi Tyagi 
</script>

Output :

Sum of given array is 34

Time Complexity: O(n)

Auxiliary Space: O(1)

Another Method: Using STL
Calling inbuilt function for sum of elements of an array in STL.
accumulate(first, last, sum);
first, last : first and last elements of range
whose elements are to be added
sum : initial value of the sum

This function returns the array sum.

C++

/* C++ Program to find sum of elements
in a given array */
#include <bits/stdc++.h>
using namespace std;
 
// Driver code
int main()
{
    int arr[] = {12, 3, 4, 15};
    int n = sizeof(arr) / sizeof(arr[0]);
      // calling accumulate function, passing first, last element and
    // initial sum, which is 0 in this case.
    cout << "Sum of given array is " << accumulate(arr, arr + n, 0);
    return 0;
}
 
// This code is contributed by pranoy_coder

Python3

# Python3 program to find sum of elements
# in a given array
 
# Driver code
if __name__ == "__main__":
   
    arr = [ 12, 3, 4, 15 ]
    n = len(arr)
     
    # Calling accumulate function, passing
    # first, last element and initial sum,
    # which is 0 in this case.
    print("Sum of given array is ", sum(arr));
 
# This code is contributed by ukasp