/* integer promotion */ int printf(const char*, ...); #define promote(s) printf(" %ssigned : %s\n", (s) - 100 < 0 ? " " : "un", #s); int main (void) { struct { unsigned u3:3; unsigned u31:31; unsigned u32:32; unsigned long ul31:31; unsigned long ul32:32; unsigned long long ull31:31; unsigned long long ull32:32; unsigned long long ull33:33; unsigned long long ull64:64; unsigned char c; } s = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }; promote(s.u3); promote(s.u31); promote(s.u32); promote(s.ul31); promote(s.ul32); promote(s.ull31); promote(s.ull32); promote(s.ull33); promote(s.ull64); promote(s.c); printf("\n"); promote((1 ? s.u3 : 1)); promote((1 ? s.u31 : 1)); promote((1 ? s.u32 : 1)); promote((1 ? s.ul31 : 1)); promote((1 ? s.ul32 : 1)); promote((1 ? s.ull31 : 1)); promote((1 ? s.ull32 : 1)); promote((1 ? s.ull33 : 1)); promote((1 ? s.ull64 : 1)); promote((1 ? s.c : 1)); printf("\n"); promote(s.u3 << 1); promote(s.u31 << 1); promote(s.u32 << 1); promote(s.ul31 << 1); promote(s.ul32 << 1); promote(s.ull31 << 1); promote(s.ull32 << 1); promote(s.ull33 << 1); promote(s.ull64 << 1); promote(s.c << 1); printf("\n"); promote(+s.u3); promote(+s.u31); promote(+s.u32); promote(+s.ul31); promote(+s.ul32); promote(+s.ull31); promote(+s.ull32); promote(+s.ull33); promote(+s.ull64); promote(+s.c); printf("\n"); promote(-s.u3); promote(-s.u31); promote(-s.u32); promote(-s.ul31); promote(-s.ul32); promote(-s.ull31); promote(-s.ull32); promote(-s.ull33); promote(-s.ull64); promote(-s.c); printf("\n"); promote(~s.u3); promote(~s.u31); promote(~s.u32); promote(~s.ul31); promote(~s.ul32); promote(~s.ull31); promote(~s.ull32); promote(~s.ull33); promote(~s.ull64); promote(~s.c); printf("\n"); promote(!s.u3); promote(!s.u31); promote(!s.u32); promote(!s.ul31); promote(!s.ul32); promote(!s.ull31); promote(!s.ull32); promote(!s.ull33); promote(!s.ull64); promote(!s.c); printf("\n"); promote(+(unsigned)s.u3); promote(-(unsigned)s.u3); promote(~(unsigned)s.u3); promote(!(unsigned)s.u3); return 0; }