Why Doesn't the Modulus Operator Work with Doubles in C and How Can I Fix It?

Inability to Utilize Modulus Operator with Double Variables

In programming, the modulus operator (%) is typically utilized to calculate the remainder after integer division. However, attempting to apply this operator to double-precision floating-point numbers in C may result in an error message stating that the operands are invalid. To rectify this issue, we need to employ a different approach.

The error arises due to the fact that the modulus operator is intended for integer variables, which can only assume whole number values. Double variables, on the other hand, represent fractional numbers. To perform a similar operation on doubles, we must resort to the fmod() function.

Here's how to resolve the issue using the fmod() function:

#include <cmath>

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

The fmod() function is defined in the library and operates similarly to the modulus operator. However, it returns the remainder after dividing the first operand (x) by the second operand (y) as double-precision floating-point numbers. By incorporating this function, we can successfully utilize the modulus operation on doubles in our C program.

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