On Mon, Feb 4, 2019 at 5:34 AM Miki Tebeka <[email protected]> wrote:
> A bit of profiling shows that the modulo operator takes most of the time:
C's modulo operator is faster, but can crash if you look at it funny.
$ cat x.c
#include <stdio.h>
int main(int argc, char** argv) {
int x = -2147483648;
int y = -1;
printf("x=%d\n", x);
printf("y=%d\n", y);
printf("m=%d\n", x % y);
return 0;
}
$ gcc x.c && ./a.out
x=-2147483648
y=-1
Floating point exception
Compare it to the output of https://play.golang.org/p/Yj2RZmB7ZRI
Yes, both the Go code and the C code will panic if y is zero. Still,
"-2147483648 % -1" has a sensible mathematical definition (zero), and
C fails to calculate it.
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