Pointer in C++ : Hacker Rank Solution : Digit Wood


A pointer in C++ is used to share a memory address among different contexts (primarily functions). They are used whenever a function needs to modify the content of a variable, but it does not have ownership.
In order to access the memory address of a variable, , prepend it with sign. For example, &val returns the memory address of .

This memory address is assigned to a pointer and can be shared among functions. For example, assigns the memory address of to pointer . To access the content of the memory pointed to, prepend the variable name with a *. For example, *p will return the value stored in and any modification to it will be performed on .

void increment(int v) { (v)++;

int main() {
int a;
scanf(“%d”, &a);
printf(“%d”, a);
return 0;
Function Description

Complete the update function in the editor below.

update has the following parameters:

int *a: an integer
int *b: an integer

The function is declared with a void return type, so there is no value to return. Modify the values in memory so that contains their sum and contains their absoluted difference.

a’ = a + b

b’ = |a – b|

Input Format
Input will contain two integers, and , separated by a newline.

Sample Input


Sample Output



a’ = 4 + 5
b’ = |4 – 5|


#include <iostream>
using namespace std;

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

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

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