Sum of consecutive two elements in a array
Last Updated :
20 Feb, 2023
Given an array print sum of the pairwise consecutive elements.
Examples:
Input : 8, 5, 4, 3, 15, 20
Output : 13, 9, 7, 18, 35
Input : 5, 10, 15, 20
Output : 15, 25, 35
The solution is to traverse the array and saving the sum of consecutive numbers in the variable sum.
Implementation:
C++
// C++ program to print the
// sum of the consecutive elements.
#include <stdio.h>
#include <stdlib.h>
// Function to print pairwise sum
void pairwiseSum(int arr[], int n)
{
int sum = 0;
for (int i = 0; i < n - 1; i++)
{
// adding the alternate numbers
sum = arr[i] + arr[i + 1];
printf(" %d ", sum);
}
}
// Driver function to test function
int main()
{
int arr[] = {4, 10, 15, 5, 6};
int n = sizeof(arr) / sizeof(arr[0]);
pairwiseSum(arr, n);
return 0;
}
// Java program to print the
// sum of the consecutive elements.
class Arraysum {
// Function to print Alternatesum
static void pairwiseSum(int arr[], int n)
{
int sum = 0;
for (int i = 0; i + 1 < n; i++)
{
// adding the alternate numbers
sum = arr[i] + arr[i + 1];
System.out.print(sum + " ");
}
}
/*driver function to test function*/
public static void main(String[] args)
{
int arr[] = {4, 10, 15, 5, 6};
int n = arr.length;
pairwiseSum(arr, n);
}
}
# Python3 program to print the
# sum of the consecutive elements.
# Function to print alternate sum
def pairwiseSum(lst, n):
sum = 0;
for i in range(len(lst)-1):
# adding the alternate numbers
sum = lst[i] + lst[i + 1]
print (sum, end = " ")
# driver function to test function
arr =[4, 10, 15, 5, 6]
size = len(arr)
pairwiseSum(arr, size)
// C# program to print the
// sum of the consecutive elements.
using System;
class Arraysum {
// Function to print Alternatesum
static void pairwiseSum(int []arr, int n)
{
int sum = 0;
for (int i = 0; i + 1 < n; i++)
{
// adding the alternate numbers
sum = arr[i] + arr[i + 1];
Console.Write(sum + " ");
}
}
// Driver function
public static void Main()
{
int []arr = {4, 10, 15, 5, 6};
int n = arr.Length;
pairwiseSum(arr, n);
}
}
// This code is contributed by vt_m.
<?php
// PHP program to print the
// sum of the consecutive elements.
// Function to print pairwise sum
function pairwiseSum($arr, $n)
{
$sum = 0;
for ($i = 0; $i < $n - 1; $i++)
{
// adding the alternate numbers
$sum = $arr[$i] + $arr[$i + 1];
echo $sum," ";
}
}
// Driver Code
$arr = array (4, 10, 15, 5, 6);
$n = sizeof($arr) ;
pairwiseSum($arr, $n);
// This code is contributed by ajit
?>
<script>
// Javascript program to print the
// sum of the consecutive elements.
// Function to print Alternatesum
function pairwiseSum(arr, n)
{
let sum = 0;
for(let i = 0; i + 1 < n; i++)
{
// Adding the alternate numbers
sum = arr[i] + arr[i + 1];
document.write(sum + " ");
}
}
// Driver code
let arr = [ 4, 10, 15, 5, 6 ];
let n = arr.length;
pairwiseSum(arr, n);
// This code is contributed by divyesh072019
</script>
Time Complexity: O(n) where n is no of elements in given array
Auxiliary Space: O(1) because it is using constant space for variables
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