255, 0377, 0xff // Integers (decimal, octal, hex)
2147483647L, 0x7fffffffl // Long (32-bit) integers
123.0, 1.23e2 // double (real) numbers
'a', '141', 'x61' // Character (literal, octal, hex)
'
', '', ''', '"' // Newline, backslash, single quote, double quote
"string
" // Array of characters ending with newline and
"hello" "world" // Concatenated strings
true, false // bool constants 1 and 0
nullptr // Pointer type with the address of 0