c++ divmod operator undefined behavior

divmod.md

cppreference

compiler explor

#include <cstdio>
#include <limits>

int foo(int a, int b)
{
    return b == 0 ? 0 : a % b;
}

int bar(int a, int b)
{
    return b == 0 ? 0 : (long) a % b;  // need consider both zero division and int overflow
}

int main()
{
  	printf("%d\n", foo(1, 2));
  	printf("%d\n", foo(1, 0));
    printf("%d\n", foo(-1, 3));
    //printf("%d\n", foo(std::numeric_limits<int>::min(), -1));  // error code 136

    printf("%d\n", bar(1, 2));
  	printf("%d\n", bar(1, 0));
    printf("%d\n", bar(-1, 3));
    printf("%d\n", bar(std::numeric_limits<int>::min(), -1));

    return 0;
}