gcc-you can use this code to learn something about gcc, and inquire further into linux,
源代码在线查看: f-31-9-0.c
#include struct sss{ int i1:31; int i2:9; int :0; }; static union u{ struct sss sss; unsigned char a[sizeof (struct sss)]; } u; int main (void) { int i; for (i = 0; i < sizeof (struct sss); i++) u.a[i] = 0; u.sss.i1 = 2147483647.0; for (i = 0; i < sizeof (struct sss); i++) printf ("%x ", u.a[i]); printf ("\n"); u.sss.i2 = 511.0; for (i = 0; i < sizeof (struct sss); i++) printf ("%x ", u.a[i]); printf ("\n"); return 0; }