Pointers in C - Hackerrank Solution

Objective

In this challenge, 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). They are primarily used whenever a function needs to modify the content of a variable, of which it doesn't have ownership. In order to access the memory address of a variable,

, we need to prepend it with

sign. E.g., &val returns the memory address of

. This memory address is assigned to a pointer and can be shared among various functions. E.g.

will assign the memory address of

to pointer

. To access the content of the memory to which the pointer points, prepend it with a *. For example, *p will return the value reflected by

and any modification to it will be reflected at the source (

 void increment(int *v) {
        (*v)++; 
    }
       int main() {
        int a;
        scanf("%d", &a);
        increment(&a);
        printf("%d", a);
     return 0;      
    }





Task

You have to complete the function void update(int *a,int *b), which reads two integers as argument, and sets  with the sum of them, and  with the absolute difference of them.










Input Format




The input will contain two integers,  and , separated by a newline.






Output Format




You have to print the updated value of  and , on two different lines.

Note: Input/ouput will be automatically handled. You only have to complete the function described in the 'task' section.


Sample Input

    4    5


Sample Output

   9   1

#include <stdio.h>

void update(int *a,int *b) {
    int t=*a;
    *a=*a+*b;
    if(*b>t)
    *b=*b-t;
    else
    *b=t-*b;
    // Complete this function    
}

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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Pointers in C - Hackerrank Solution