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Why does the first line compile and the second not?
string var = "123";
var string = "123";
I mean string and var should be both keywords..
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Keywords are the words whose meaning has already been explained to the C compiler. They have a specific meaning and they implement specific C language features. Keywords can be used only for their intended purpose. They cannot be used as names for variables or other user-defined program elements.
In a computer language, a reserved word (also known as a reserved identifier) is a word that cannot be used as an identifier, such as the name of a variable, function, or label – it is "reserved from use".
Keywords are reserved words that have a special meaning to the Java compiler. As Java compiler reserves these words for its own use so they are not available as names for variables or methods.
Reserved keywords cannot be used as variable names. Reserved keywords are ALL, AND, BY, EQ, GE, GT, LE, LT, NE, NOT, OR, TO, and WITH. Variable names can be defined with any mixture of uppercase and lowercase characters, and case is preserved for display purposes.
var is a contextual keyword, whereas string is not.
Contextual keywords are
used to provide a specific meaning in the code, but it is not a reserved word in C#.
This is why you can use var as a variable name.
Presumably, this is for backwards compatibility. If var were introduced as a proper keyword, old code that uses var as a variable name would break.
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