Can't use modulus on doubles?

Question

I have a program in C++ (compiled using g++). I'm trying to apply two doubles as operands to the modulus function, but I get the following error:

error: invalid operands of types 'double' and 'double' to binary 'operator%'

Here's the code:

int main() {
    double x = 6.3;
    double y = 2;
    double z = x % y;
}

Answer 1

The % operator is for integers. You're looking for the fmod() function.

#include <cmath>

int main()
{
    double x = 6.3;
    double y = 2.0;
    double z = std::fmod(x,y);

}