#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
typedef unsigned char uchar;

uchar get_bit(uchar ch, int bit_idx) {
    ch = ch << bit_idx;
    return ch >> 7;
    //return (uchar)(ch << bit_idx) >> 7;  // also okay

    //return (ch << bit_idx) >> 7;  // wrong!!
    //return (ch << (uchar)bit_idx) >> 7;  // wrong!!  ... but why?
}

int main(int argc, char* argv[]) {
    assert( get_bit(0b11001001, 0) == 1 );
    assert( get_bit(0b11001001, 2) == 0 );
    return EXIT_SUCCESS;
}





    /* printf("get_bit(0b11001001, 0) == %d\n", (int)get_bit(0b11001001, 0)); */
    /* printf("get_bit(0b11001001, 2) == %d\n", (int)get_bit(0b11001001, 2)); */
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */