Literal literals in C + + specify a type

Only built-in types exist in C + +, and there is no class-type literal value.
For example: 0 is the literal value of type int, and 3.14159 is a type literal of double.

Many types of literal literals

integer floating-point literals                   //decimal    decimal 024     &NBSP ;            // octal      octal 0x14         &NBSP ;      //  hexadecimal      hex 128u, 128U        //&nbs P;  unsigned1024ul              //   unsigned long1l                    //     long   Long plastic 8Lu   & nbsp              //     unsigned long3.14159f = 3.14159e0f &nb sp;//float  , scientific count. 001f  = 1e-3f  //float, scientific count 12.345L = 1.2345e1l  //long double   extended precision , Science counts 0.  = 0e0  //Double, scientific count ' a '//char      character l ' a '  //wch ar_t &Nbsp;  wide characters//no literal constants for short    string LiteralsString literals are a string of constant characters, string literal constants are enclosed in double quotation marks, and character literal constants are enclosed in single quotation marks. In order to be compatible with the C language, string literals in C + + will be automatically added by the compiler to an empty string at the end.: ' A ': Represents a single character a "a": a string representing a character A and a null character two characters similarly there is a wide string L "a wide string literal": A string of wide characters + wide-empty character strings literal connection different types of strings cannot be concatenated: string literals and wide string literals cannot be concatenatedStd::cout << "a multi-line"                       "string literal"                       "using concatenation"                      << Std::endl: A multi-line string literal using concatenation but std::cout << "multi-line"    & Nbsp;                 l " Literal "<<std::endl; will compile the error. In addition, there is one more line literal: Std::cout <<" A multi-line \string literal \using concatenation "& lt;< Std::endl; note that "\" must be at the end of the line, followed by No comments or spaces   ------------------------------------------------------ -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ----------------------

Literal literals in C + + specify a type