How to fix C/C++ round(): error: invalid operands of types 'float' and 'int' to binary 'operator&'

Problem:

You are trying to compile a C/C++ program but you see an error message like

src\main.cpp:357:21: error: invalid operands of types 'float' and 'int' to binary 'operator&'

that refers to a line like

long m = round(v) & 0x7FF;

Solution

The result of round() is a floating point number. You are trying to use the & operator to perform bitwise AND of a float and an int (0x7FF in the example above). However, you can not perform bitwise operation on floats in C/C++.

In order to fix this, case the result of round() to int:

long m = ((int)round(v)) & 0x7FF;

That should fix the compiler error.