Pointer in c++ : Hacker Rank Solution : Techno Learner

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   Techno Learner 

   Pointer
   
   

Objective

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);
    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  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

        4

        5

Sample Output

        9    

        1

Explanation

• a' = 4 + 5
• b' = |4 - 5|

 

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Techno Learner

Solution  C++ :

#include <cstdio>

#include <cstdlib>  // required to use the built-in abs() function

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;

    

    scanf("%d %d", &a, &b);

    update(pa, pb);

    printf("%d\n%d", a, b);

    return 0;

}

 

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