/* Input a number and watch it get clobbered by another! */

#include <stdio.h>
#include <stdlib.h>

#define answer(__op1) __asm__ ( \
    "movl $42, %0\n\t" \
    : "=r" (__op1) \
    : "0" (__op1) \
);

int main(int argc, char *argv[])
{
    if (argc != 2) {
        fputs("Usage: asm_test NUMBER\n", stderr);
        exit(EXIT_FAILURE);
    }

    int x = strtol(argv[1], NULL, 10);
    answer(x);

    printf("%d\n", x);
}