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Use of Macros used in windows-dot-h

What is the use of Macros used in header files?

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Macros make the programming easier as well as it provides customizable features for a program.

a. Macros allow the user to write some functions which can be involved directly into the program which is being created.

b. Macros make the program short as well as make the calling from one function to another function easier.

c. Macros are used for computing instructions using the single program statements making the program task less tedious and error-prone.

e. Macros provide positional / keyword parameters to be used with the conditional assembler program.

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