Which variables should I typecast when doing math operations in C/C++?

Question

For example, when I\'m dividing two ints and want a float returned, I superstitiously write something like this:

int a = 2, b = 3;
float c = (float)a / (floa         


        

Answer 1

In the case of the floating-point division, as long as one variable is of a floating-point datatype (float or double), then the other variable should be widened to a floating-point type, and floating-point division should occur; so there's no need to cast both to a float.

Having said that, I always cast both to a float, anyway.