Question

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Division in C++ not working as expected

Turns out my program has been returning wrong results, so I decided to break the code into little pieces. After setting breakpoint, turns out that…

double test3 = ((2 - 1) / 2);

…equals 0 according to C++ compiler. I have no idea why. Can someone explain it to me?

I’m using MS Visual Studio Premium 2012

Answer 1

Because you are doing integer division. 1/2 is 0, which is then converted to double, yielding 0.. If you want floating point division, try making one of the arguments of the division a floating point number:

double test3 = (2.0-1)/2;