int main() {
	1;							// decimal
	2_1;
	2_147_483_647;
	37LL;
	45ull;
	89llu;
	99LLu;
	56_lu;
	88_LLu;

//	0;							// octal
	0u;
	0_3_77;
	0_377_ul;

	0x1;						// hexadecimal
	0x1u;
	0xabL;
	0x_80000000;
	0x_fff;
	0x_ef3d_aa5c;
	0x_3LL;

	3.;							// integral real
	3_100.;
	1_000_000.;

	3.1;						// integral/fractional real
	3.141_592_654L;
	123_456.123_456;

	3E1;						// integral/exponent real
	3_e1f;
	3_E1_1_F;
	3_E_11;
	3_e_+11;
	3_E_-11;

	3.0E1;						// integral/fractional/exponent real
	3.0_E1L;
	3.0_e1_1;
	3.0_E_11_l;
	3.0_e_+11l;
	3.0_E_-11;
	123_456.123_456E-16;

	0x_ff.ffp0;					// hex real
	0x_1.ffff_ffff_p_128_l;
}