Why Doesn't the Modulus Operator Work with Doubles in C ?

Double Values and the Modulus Operation

In programming, the modulus operator (%) calculates the remainder when one number is divided by another. However, in C , trying to apply the modulus operation to two double-precision floating-point numbers (doubles) results in an error.

The following code demonstrates this issue:

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

Upon compilation, this code generates an error:

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

This error occurs because the modulus operator is defined only for integer operands. For doubles, the equivalent function is fmod(). To use the modulus operation with double values, use fmod() as follows:

#include <cmath>

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

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