Pointers in C - Hacker Rank Solution

What challenge you will learn from the problem

This solution will help you To learn how to use pointers you will learn to implement the basic functionalities of pointers in C. A Pointer in C is a way to share a memory address among different contexts (primarily functions).

Pointer In c Hacker Rank Solutions

About-Problem

In order to access the memory address of a variable, For example, &val returns the memory address of .

This memory address is assigned to a pointer and can be shared among various functions. For example, we will assign the memory address of to pointer .

To access the content of the memory to which the pointer points, depend with a *. For example, *p will return the value reflected by and any modification to it will be reflected at the source ().

Given question

Complete the function void update(int *a,int *b). It receives two integer pointers, int* a and int* b. Set the value of to their sum, and to their absolute difference. There is no return value, and no return statement is needed.

Absolute difference means

Absolute difference means after the subtraction there will be no negative sign.
diff=abs(*a-*b);

#include <stdio.h>

#include<stdlib.h>

void update(int *a,int *b)

{

int sum=0,diff;

sum=*a+*b;

diff=abs(*a-*b);

*a=sum;

*b=diff;

}

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;

}

Output

your input=

your output=

Then we make a function of name update with no return type and take two arguments(references).

Then inside the function we declare the sum=0,diff and do the calculation for the sum and difference.

and in the difference we have to do abstract difference so that we use (abs) keyword for this difference.

Then in the main function we declare to variable and store the adress in the pointer then pass the values to the function update and return 0; program ends.