Once preprocessing is over and the program is sent for the compilation the macros are removed from the expanded source code.

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.

True, these macros are used for conditional operation.

True, the programmer tells the compiler to include the preprocessor when compiling.

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

True, the header file contains classes, function prototypes, structure declaration, macros.

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.