Algorithm
Problem Name:
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);
}
Input
Output