Pointer Pointer Discussions | C++ | HackerRank Pointer Discussions | C++ | HackerRank

 

Pointer  

Pointer Discussions | C++ | HackerRank 

A pointer 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; 

} 

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 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. 

P.S.: Input/ouput will be automatically handled. 

You only have to complete the void update(int *a,int *b) function. 

Sample Input 

4 5 

Sample Output

9 1

Explanation: 

4+5=9

4-5= 1

#include <stdio.h>

void update(int *a,int *b) {

    // Complete this function 

    int temp;

    temp=*a; 

    *a+=*b;

    *b=temp-*b;

    if(*b<0) 

    *b= (-1* (*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;

} 

https://www.blogger.com/blog/posts/1819317331536741523

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