modulus not wrapping properly - unofficial respone

VEX V5 General Discussion General Forum
1

Hi,

For the modulus function, I’m fairly certain that it’s wrapping correctly, based on how the modulus function is normally defined.

This statement is true for the modulus, for two integers A and B.

(A/B) * B +(A%B) = A.

Assuming that’s true, then -1/10 = 0.

And (-1/10) * 10 + (A%B) = A

So (A%B) = -1 because (-1/10) * 10 with integers is 0.

Hope that helps.

2

I tried the same code compiled in gcc.

#include <stdio.h>

int main( int crgc, char*argv] )
{
	printf("mod 11 is %d\n", 11%10 );
	printf("mod 22 is %d\n", 22%10 );
	printf("mod -1 is %d\n", -1%10 );
}

Same output as ROBOTC.

mod 11 is 1
mod 22 is 2
mod -1 is -1