Pointer in C++ - Hackerrank Solution

Pointer in C++ - Hackerrank Solution 

Hope you are having a good day coders,

Today we will learn about Pointers and using that we will be solving Pointer in C++ Hackerrank Problem.

Pointers are one of the crucial components in C++, so it is must to know about this topic.

So, Without wasting your time let's jump into the solution.

Pointer in C++ - Hackerrank Solution


Problem 

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

Solution - Pointer in C++

#include <stdio.h>

void update(int *a,int *b) {
    // Complete this function 
    int temp = *a;   
    *a = *a + *b;
    *b = temp - *b;
    
    if (*b < 0)
    {
        *b = -(*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;
}
Pointer in C++ - Hackerrank Solution
Pointer in C++ - Hackerrank Solution 
Pointer in C++ - Result


Conclusion 

So, coders today we have learned about what are Pointers in C++ and how to use them in our program. If you have any doubt regarding the problem (Pointer in C++), feel free to contact in the Comment section. 

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Disclaimer: The above problem is generated by Hacker Rank but the solution is provided by Sloth Coders.

Happy Coding!!

A Sloth Who loves to Code.