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 ;
}

Python3
def invert(x):
if (x = = 1 ):
return 2
else :
return 1

C#
static int invert( int x)
{
if (x == 1)
return 2;
else
return 1;
}

Javascript
function invert(x)
{
if (x === 1)
return 2;
else
return 1;
}

Another solution is to use subtraction
C
int invertSub( int x)
{
return (3x);
}

Java
static int invertSub( int x)
{
return ( 3 x);
}

Python3
def invertSub(x):
return ( 3  x)

C#
static int invertSub( int x)
{
return (3x);
}

Javascript
function invertSub(int x)
{
return (3x);
}

We can also use bitwise xor operator.
C
int invertXOR( int x)
{
return (x ^ 1 ^ 2);
}

This article is contributed by Anuj. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above