I'm trying to implement a fraction function in kot...

# kotlin-native

[Nico Buescher]

I'm trying to implement a fraction function in kotlin native (opposite of truncate), and given the following C code:

#include <stdio.h>
float fract(float x) {
    return x - (long)x;
}
int main() {
    printf("%f", fract(2.3f));
}

with output 0.3, I expected the same output from kotlin code:

fun fract(x: Float): Float {
	return x - x.toLong()
}

fun main() {
	println(fract(2.3f))
}

instead I get: 0.29999995

What's happening here?

[Erik Christensen]

It's likely just the decimal precision setting for the strings generated by the print functions you're using. They may be different by default.

[Markus Böck]

Correct, printf by default has a precision of 6 digits

[Markus Böck]

You can also see in a debugger that in C it too has the same value

[Nico Buescher]

Ooooooh. That makes so much sense. Thanks!