Why in modulus division on floats or doubles cannot be performed in C programming?

Question

Example:

float x=22.313,
y=17.27;
printf("%f", x%y ); //error

Answer 1

you can use fmod() function from <math.h> to compute modulo of irrational numbers:

https://en.cppreference.com/w/c/numeric/math/fmod

Answer 2

in C/C++ both operands must be whole numbers ^^

Answer 3

https://stackoverflow.com/questions/6102948/why-does-modulus-division-only-work-with-integers

Answer 4

because modulo operator only works on whole numbers: performs whole division (return rest)

Answer 5

Why it cant find the remainder for the division of two irrational numbers? Why the author designed modulo that won't work for this situation? I'm asking for the reason.

Answer 6

because there's no remainder when using irrational division...

however you could compute what you expect by doing:

int i = x/y;
float r = x - i*y;

at least for y as whole number...

Answer 7

Here's a manual build:

float flmod(float a, float b) { return a - (int) (a / b) * b; }

# Hope this helps