#define
The #define directive assigns the given value to the specified name. All subsequent occurrences of the name are replaced by the value.
#define name value
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name
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Name to be defined. This value is any combination of letters, digits, and punctuation that is valid for the C/C++ preprocessor.
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value
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Integer, character string, or line of text.
Example
This example assigns values to the names NONZERO and USERCLASS:
#define NONZERO 1
#define USERCLASS "MyControlClass"
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