## Algorithm

Problem Name: Pointer

In this HackerRank Functions in C++ programming problem solution,

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.

his 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
``````

## Code Examples

### #1 Code Example with C++ Programming

```Code - C++ Programming```

``````
#include <iostream>
#include <cmath>
using namespace std;

void update(int *a, int *b);

int main(void)
{
int a, b;
int *pa = &a, *pb = &b;

cin >> a >> b;
update(pa, pb);

cout << a << endl;
cout << b << endl;

return 0;
}

void update(int *a, int *b)
{
int temp = *a;
*a = *a + *b;
*b = abs(temp - *b);
}
``````
Copy The Code &

Input

cmd
4 5

Output

cmd
9 1