Set a variable without using Arithmetic, Relational or Conditional Operator
Given three integers a, b and c where c can be either 0 or 1. Without using any arithmetic, relational and conditional operators set the value of a variable x based on below rules –
If c = 0 x = a Else // Note c is binary x = b.
Input: a = 5, b = 10, c = 0; Output: x = 5 Input: a = 5, b = 10, c = 1; Output: x = 10
Solution 1: Using arithmetic operators
If we are allowed to use arithmetic operators, we can easily calculate x by using any one of below expressions –
x = ((1 - c) * a) + (c * b) OR x = (a + b) - (!c * b) - (c * a); OR x = (a * !c) | (b * c);
Solution 2: Without using arithmetic operators
The idea is to construct an array of size 2 such that index 0 of the array stores value of variable ‘a’ and index 1 value of variable b. Now we return value at index 0 or at index 1 of the array based on value of variable c.
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