c++ feature samples

C++20/23 samples

C++ Cheatsheet

ASCII printable characters

DEC	HEX	Symbol	Description	Tips
0	0x01	NUL	Null character
10	0x0A	LF
13	0x0D	CR
32	0x20	SP	Space	Start symbol
48	0x30	0	number zero
57	0x39	9
64	0x40	@
65	0x41	A	Capital A
90	0x5A	Z
97	0x61	a	lower-case a
122	0x7A	z