# Write a function that returns 2 for input 1 and returns 1 for 2

• Difficulty Level : Easy
• Last Updated : 11 Nov, 2021

Write a function which returns 1 that 2 is passed and return 2 when 1 is passed.
Source: Adobe Interview Experience | Set 19 (For MTS)
A simple solution is to compare the passed value with 1 and 2.

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## C

 `int` `invert(``int` `x)``{``   ``if` `(x == 1) ``return` `2;``   ``else` `return` `1;``}`

## Java

 `static` `int` `invert(``int` `x)``{``   ``if` `(x == ``1``) ``return` `2``;``   ``else` `return` `1``;``}` `// This code is contributed by rishavmahato348.`

## Python3

 `def` `invert(x):``   ``if` `(x ``=``=` `1``):``      ``return` `2``    ``else``:``      ``return` `1` `    ``# This code is contributed by rishavmahato348.`

## C#

 `static` `int` `invert(``int` `x)``{``    ``if` `(x == 1)``        ``return` `2;``    ``else``        ``return` `1;``}` `// This code is contributed by rishavmahato348.`

## Javascript

 `function` `invert(x)``{``   ``if` `(x === 1)``           ``return` `2;``   ``else``           ``return` `1;``}` `// This code is contributed by subham348.`

Another solution is to use subtraction

## C

 `int` `invertSub(``int` `x)``{``   ``return` `(3-x);``}`

## Java

 `static` `int` `invertSub(``int` `x)``{``   ``return` `(``3``-x);``}` `// This code is contributed by shivanisinghss2110`

## Python3

 `def` `invertSub(x):` `   ``return` `(``3``-``x)` `# this code is contributed by shivanisinghss2110`

## C#

 `static` `int` `invertSub(``int` `x)``{``   ``return` `(3-x);``}` `// This code is contributed by subham348.`

## Javascript

 `function` `invertSub(int x)``{``   ``return` `(3-x);``}` `// This code is contributed by shivanisinghss2110`

We can also use bitwise xor operator.

## C

 `int` `invertXOR(``int` `x)``{``   ``return` `(x ^ 1 ^ 2);``}`