<<Pointer>> _HakerRank_C++_Introduction

#include <stdio.h>void update(int *a, int *b) {    // Complete this function         *a = *a + *b ;    *b = *a - *b - *b ;      if( *b < 0) *b = 0 - *b ;  }int main() {    int a, b;    int *pa = &a, *pb = &b;        scanf("%d %d", &a, &b);    update(pa, pb);    printf("%d\n%d", a, b);    return 0;}

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, val, prepend it with & sign. For example, &val returns the memory address of val.

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

void increment(int * v) { (* v)++; }int main() {    int a;    scanf("%d", &a);    increment(&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

Returns
●The function is declared with a void return type, so there is no value to return. Modify the values in memory so that a contains their sum and b contains their absoluted difference.
● a' = a + b
● b' = |a - b|

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

Sample Input
4
5

Sample Output
9
1

Explanation
● a' = 4 + 5 = 9
● b' = |4 - 5| = 1