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say hello world with C++ - Solution in Hacker Rank - hackerranksolutions8

  Objective This is a simple challenge to help you practice printing to  stdout . You may also want to complete  Solve Me First  in C++ before attempting this challenge. We’re starting out by printing the most famous computing phrase of all time! In the editor below, use either  printf  or  cout  to print the string  Hello ,World!  to  stdout . The more popular command form is  cout . It has the following basic form: cout<<value_to_print<<value_to_print; Any number of values can be printed using one command as shown. The  printf  command comes from C language. It accepts an optional format specification and a list of variables. Two examples for printing a string are: printf("%s", string);   printf(string); Note that neither method adds a newline. It only prints what you tell it to. Output Format Print   Hello ,World!   to stdout. Sample Output Hello, World! Solution:- //Say Hello, ...
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Pointer 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,val , we need to prepend it with & sign. E.g., &val returns the memory address of val .

This memory address is assigned to a pointer and can be shared among various functions. E.g. int*p=&val will assign the memory address of val to pointer p . 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 val and any modification to it will be reflected at the source (val).

	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 b  with the absolute difference of them.

  • a’=a+b
  • b’=|a-b|

Input Format

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

Output Format

You have to print the updated value of a and b , 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

Explanation

  • a’=4+5=9
  • b’=|4-5|=1

Code:

#include <stdio.h>

void update(int *a,int *b) {
    int c,d;
    scanf("%d\n%d",a,b);
    *a=*a+*b;
    *b=abs(*a-(2**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;
}

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