Pointers in C - Hackerrank solution

 

Pointers in C

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Objective

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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 ().

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

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Task

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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.

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Solution:

#include <stdio.h> #include <stdlib.h> void update(int *a,int *b) { int sum=0,diff=0; 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; }

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Note:

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