#include main() { if (sizeof(long) == 4) { union {double d; unsigned long l[2];} x; x.d = 2.; if (x.l[0]==0 && x.l[1]==(1UL<<30)) printf("1\n"); else if (x.l[1]==0 && x.l[0]==(1UL<<30)) printf("0\n"); else printf("NOT IEEE (32 bit)\n"); } else { union {double d; unsigned long l;} x; x.d = 2.; if (x.l==(1UL<<62)) printf("-\n"); else printf("NOT IEEE (64 bit)\n"); } }