Pointers in C++ HackerRank solution

Pointers are the initial steps towards advancement in the programming mindset. A pointer holds a memory address which can be helpful to solve problems in an alternative way by accessing variables. This tutorial will help you with the pointers in C++ HackerRank solution.

Problem statement

A pointer in C++ is used to share a memory address among different contexts. They are used whenever a function needs to modify the content of a variable, but it does not have ownership…

You can check out the complete problem on Pointers at HackerRank.

Also Read: Hackerrank problem on For loop

Solution

An update() function is defined which takes two int pointers as arguments. It creates a temp integer and holds the sum of two passed arguments, the second argument b holds the subtraction of the pointers. Later the temp value is passed onto the a pointer.

In this scenario, a and b are the pa & pb passed as pointers of the main a & b. The abs() converts any input to a positive number.

#include <stdio.h>
#include <iostream>

using namespace std;

int update(int *a,int *b) {
    int temp;
    temp = *a + *b;
    *b = abs(*a - *b);
    *a = temp;
    return *a, *b;
}

int main() {
    int a, b;
    int *pa = &a, *pb = &b;    
    cin >> a >> b;
    update(pa, pb);
    cout << a << endl << b;
    return 0;
}