what is literals(constants)
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✷Literals are data items that are fixed data values. It's value cannot be changed.
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literal is a token whose spelling directly contains the information that determines its type and value.
There are seven kinds of literals
Integer literals, such as 42, which have non-boolean integral type.
Character literals, such as 'x', which have type char, char16_t, char32_t, or wchar_t.
Floating literals, such as 3.14, which have floating-point type.
String literals, such as "Hello, world", which have array of constant character type (where a character type is again char, char16_t, char32_t, or wchar_t.)
The boolean literals true and false, which have type value.
The null pointer literal nullptr, which has type std::nullptr_t, which can be implicitly converted to the null pointer of any pointer type.
User-defined literals, which take the form of integer, character, floating, or string literals, but followed by a user-defined literal suffix that determines their type. These are an exception to the rule that a literal's spelling completely determines its type and value: you need to see the definition of the literal operator to know its type and value. User-defined literals can be thought of more like syntactic sugar than actual literals.
There are seven kinds of literals
Integer literals, such as 42, which have non-boolean integral type.
Character literals, such as 'x', which have type char, char16_t, char32_t, or wchar_t.
Floating literals, such as 3.14, which have floating-point type.
String literals, such as "Hello, world", which have array of constant character type (where a character type is again char, char16_t, char32_t, or wchar_t.)
The boolean literals true and false, which have type value.
The null pointer literal nullptr, which has type std::nullptr_t, which can be implicitly converted to the null pointer of any pointer type.
User-defined literals, which take the form of integer, character, floating, or string literals, but followed by a user-defined literal suffix that determines their type. These are an exception to the rule that a literal's spelling completely determines its type and value: you need to see the definition of the literal operator to know its type and value. User-defined literals can be thought of more like syntactic sugar than actual literals.
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