Yes they is different, C language are case-sensitive.
Identifiers are a bit more generic in the context of programming. If you mean, in terms of the C languages (C, C++, C#), the question is the reverse...keywords may NOT be used as identifiers. For example, you cannot use keywords such as "int", "float", "double", etc. as the names of variables or objects.
Invalid variable names are identifiers that are not recognised by the language compiler. All user-defined identifiers (both names and type definitions) must be introduced to the compiler by a declaration. A definition is also a declaration, however a definition is not required to use a name, only the declaration. However, all declarations must be defined somewhere. Different programming languages have different conventions for naming identifier. However, in most languages, a name must always begin with a letter or an underscore, never a digit, because a leading digit usually signifies a value and would only complicate the language compiler's implementation. Case-sensitive languages, such as C treat 'name', 'Name' and 'NAME' as being different identifiers while case-insensitive languages will treat them as being the same identifier.
1. identifiers beginning with a letter 2. identifiers beginning with an underscore
In C++ we provide names for the entities we create, the variables, functions and types in our programs. These names, or identifiers, are required to conform to some simple rules.An identifier must start with a letter and is comprised of a sequence of letters and digits. Somewhat surprisingly, in this context the underscore _ is considered to be a letter (although there are conditions associated with its use). There's no restriction on the length of an identifier.
all keywords
If you mean 'are identifier of an object and nameof an object synonyms?', then yes, they are.
An identifier is a name. All names must be declared with a type.
Invalid variable names are identifiers that are not recognised by the language compiler. All user-defined identifiers (both names and type definitions) must be introduced to the compiler by a declaration. A definition is also a declaration, however a definition is not required to use a name, only the declaration. However, all declarations must be defined somewhere. Different programming languages have different conventions for naming identifier. However, in most languages, a name must always begin with a letter or an underscore, never a digit, because a leading digit usually signifies a value and would only complicate the language compiler's implementation. Case-sensitive languages, such as C treat 'name', 'Name' and 'NAME' as being different identifiers while case-insensitive languages will treat them as being the same identifier.
Identifiers are a bit more generic in the context of programming. If you mean, in terms of the C languages (C, C++, C#), the question is the reverse...keywords may NOT be used as identifiers. For example, you cannot use keywords such as "int", "float", "double", etc. as the names of variables or objects.
a variable having the datattype and name, an identifier is the name of the variable for example int x; here int x; is the variable x is the identifier
Invalid variable names are identifiers that are not recognised by the language compiler. All user-defined identifiers (both names and type definitions) must be introduced to the compiler by a declaration. A definition is also a declaration, however a definition is not required to use a name, only the declaration. However, all declarations must be defined somewhere. Different programming languages have different conventions for naming identifier. However, in most languages, a name must always begin with a letter or an underscore, never a digit, because a leading digit usually signifies a value and would only complicate the language compiler's implementation. Case-sensitive languages, such as C treat 'name', 'Name' and 'NAME' as being different identifiers while case-insensitive languages will treat them as being the same identifier.
1. identifiers beginning with a letter 2. identifiers beginning with an underscore
In C++ we provide names for the entities we create, the variables, functions and types in our programs. These names, or identifiers, are required to conform to some simple rules.An identifier must start with a letter and is comprised of a sequence of letters and digits. Somewhat surprisingly, in this context the underscore _ is considered to be a letter (although there are conditions associated with its use). There's no restriction on the length of an identifier.
all keywords
An identifier is the friendly name used by the compiler to represent the location of an object in memory. You could say *0x1234 = *0x3464 + *0x9587, or you could say A = B + C, given that A, B, and C, had those addresses. A, B, and C are identifiers in this example.
Letter as in A, B, C, D, ect? If that is the case, then another name for letter is "Character"
C, o, u, e