Conditionally assign a value without using conditional and arithmetic operators

Given 4 integers a, b, y, and x, where x can only either 0 and 1 only. The ask is as follows:

If 'x' is 0, 
   Assign value 'a' to variable 'y' 
Else (If 'x' is 1)
   Assign value 'b' to variable 'y'.

Note: – You are not allowed to use any conditional operator (including ternary operator) or any arithmetic operator ( +, -, *, /).

Examples :

Input :  a = 5 , b = 10, x = 1
Output :  y = 10

Input : a = 5, b = 10 , x = 0
Output :  y = 5

Asked in : Google Interview



An Idea is to simply store both 'a' and  'b' 
in an array  at 0th and 1th index respectively.
Then store value to 'y' by taking 'x' as index.

Below is implementation

C/C++

// C/C++ program  to assign value to y according
// to value of x

#include<iostream>
using namespace std;

// Function to assign value to y according
// to value of x
int assignValue(int a, int b, int x)
{
    int y;
    int arr[2];

    // Store both values in an array
    // value 'a' at 0th index
    arr[0] = a;

    // Value 'b' at 1th index
    arr[1] = b;

    // Assign value to 'y' taking 'x' as index
    y = arr[x];

    return y;
}

// Driver code
int main()
{
    int a = 5;
    int b = 10;
    int x = 0;

    cout << "Value assigned to 'y' is "
         << assignValue(a, b, x);
    return 0;
}

Java

// Java program  to assign value to y according
// to value of x

public class GFG 
{
    static int assignValue(int a, int b, int x)
    {
        int y;
        int arr[] = new int[2];
     
        // Store both values in an array
        // value 'a' at 0th index
        arr[0] = a;
     
        // Value 'b' at 1th index
        arr[1] = b;
     
        // Assign value to 'y' taking 'x' as index
        y = arr[x];
     
        return y;
    }
    
    // Driver Method
    public static void main(String[] args)
    {
         int a = 5;
         int b = 10;
         int x = 0;
         
         System.out.println("Value assigned to 'y' is " +
                             assignValue(a, b, x));
    }
}

C#

// C# program to assign value to y according
// to value of x
using System;

public class GFG {
    
    static int assignValue(int a, int b, int x)
    {
        int y;
        int []arr = new int[2];
    
        // Store both values in an array
        // value 'a' at 0th index
        arr[0] = a;
    
        // Value 'b' at 1th index
        arr[1] = b;
    
        // Assign value to 'y' taking 'x' 
        // as index
        y = arr[x];
    
        return y;
    }
    
    // Driver Method
    public static void Main()
    {
        int a = 5;
        int b = 10;
        int x = 0;
        
        Console.Write("Value assigned to "
        + "'y' is " + assignValue(a, b, x));
    }
}

// This code is contributed by nitin mittal.

PHP



<?php
// PHP program to assign value 
// to y according to value of x

// Function to assign value 
// to y according to value of x
function assignValue($a, $b, $x)
{
    $y;
    $arr = array(0, 0);

    // Store both values in an array
    // value 'a' at 0th index
    $arr[0] = $a;

    // Value 'b' at 1th index
    $arr[1] = $b;

    // Assign value to 'y' 
    // taking 'x' as index
    $y = $arr[$x];

    return $y;
}

// Driver code
$a = 5;
$b = 10;
$x = 0;

echo "Value assigned to 'y' is " .
          assignValue($a, $b, $x);

// This code is contributed by Anuj_67
?>


Output :

Value assigned to 'y' is 5

Reference : https://www.careercup.com/question?id=5135296679116800

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Improved By : nitin mittal, vt_m




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