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Problem 13 Vrite a function that takes a list and computes the alternating sum of all its elements. An alternating sum alternates between dding and subtracting elements. The example returns -2 because 1 – 4+9 – 16 +9 – 7 +4 – 9+11. Your function should eturn the alternating sum of a list. xample IO: lt-sum ([1.4.9.16.9.7.4.9.11]) #returns

Problem 13 Vrite a function that takes a list and computes the alternating sum of all its elements. An alternating sum alternates between dding and subtracting elements. The example returns -2 because 1 – 4+9 – 16 +9 – 7 +4 – 9+11. Your function should eturn the alternating sum of a list. xample IO: lt-sum ([1.4.9.16.9.7.4.9.11]) #returns

Database System Concepts
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
Section: Chapter Questions
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Problem 13 Write a function that takes a list and computes the alternating sum of all its elements. An alternating sum alternates between adding and subtracting elements. The example returns -2 because 1 – 4+9 – 16+9 – 7+4 –- 9+ 11. Your function should return the alternating sum of a list. Example IO: alt-sum ([1,4 ,9 , 16 ,9 , 7 ,4 ,9 ,11]) #returns -2
Transcribed Image Text:Problem 13 Write a function that takes a list and computes the alternating sum of all its elements. An alternating sum alternates between adding and subtracting elements. The example returns -2 because 1 – 4+9 – 16+9 – 7+4 –- 9+ 11. Your function should return the alternating sum of a list. Example IO: alt-sum ([1,4 ,9 , 16 ,9 , 7 ,4 ,9 ,11]) #returns -2
Expert Solution
Step 1

PROGRAM CODING:

#include<iostream.h>
using namespace std;

int alternate_sum(int ar[], int size)
 {
    int sign = 1, sum = 0;
    for (int a = 0; a < size; ++a)
 {
        sum += sign*arr[a];
        sign *= -1;
    }
    return sum;
}

 

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