Will the following program print the message infinite number of times?

#include<stdio.h>
#define INFINITELOOP while(1)

int main()
{
    INFINITELOOP
    printf("CuriousTab");
    return 0;
}

True, We can prevent the same file from getting included again by using a preprocessor directive called #ifndef (short for "if not defined") to determine whether we've already defined a preprocessor symbol called XSTRING_H. If we have already defined this symbol, the compiler will ignore the rest of the file until it sees a #endif (which in this case is at the end of the file).

#ifndef XSTRING_H

#define XSTRING_H defines the same preprocessor symbol,

Finally, the last line of the file, #endif

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.

True, A macro may have arguments.

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

FALSE, The macro is case insensitive.

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.

Yes, this program will compile and run successfully and prints 20.

The macro #ifdef NOTE evaluates the given expression to 1. If satisfied it executes the #ifdef block statements. Here #ifdef condition fails because the Macro NOTE is nowhere declared.

Hence the #else block gets executed, the variable a is declared and assigned a value of 20.

printf("%d\n", a); It prints the value of variable a 20.

Because typedef goes to work after preprocessing.

Reports an error: Undefined symbol 'X'

No, the header files have any kind of extension.

Yes, It prints "CuriousTab"