A header file contains macros, structure declaration and function prototypes.

False, the preprocessor directive is not mandatory in any c program.

True, After preprocessing all the macro in the program are removed.

True, #undef can be used only on a macro that has been #define earlier

Example: #define PI 3.14

We can undefine PI macro by #undef PI

True, the included file does not exist it will generate the error.

False, A macro just replaces each occurrence with the code assigned to it. e.g. SQUARE(3) with ((3)*(3)) in the program.

A function is compiled once and can be called from anywhere that has visibility to the funciton.

False, Always the macro is substituted by the given text/expression.

FALSE

Example: #define symbol replacement

When the preprocessor encounters #define directive, it replaces any occurrence of symbol in the rest of the code by replacement. This replacement can be an statement or expression or a block or simple text.

FALSE, The macro is case insensitive.

True, A macro may have arguments.

Example: #define CUBE(X)(X*X*X)

False, The scope of macros is globals and functions. Also the scope of macros is only from the point of definition to the end of the file.