Check if a variable is between two numbers with Java

Question

I have a problem with this code:

if (90 >>= angle =<< 180)

The error explanation is:

The left-hand side

Answer 1

//If "x" is between "a" and "b";

.....

int m = (a+b)/2;

if(Math.abs(x-m) <= (Math.abs(a-m)))

{
(operations)
}

......

//have to use floating point conversions if the summ is not even;

Simple example :

//if x is between 10 and 20

if(Math.abs(x-15)<=5)