Java C Preprocessor Quiz 1 | Java Question and Answers

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The preprocessor replaces the line #include with the system header file of that name. More precisely, the entire text of the file stdio.h replaces the #include directive.

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FALSE, The macro is case insensitive.

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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.

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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 have 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

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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.

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

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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

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

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The code would not compile since declaration of t cannot occur within parenthesis.

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

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True, A macro may have arguments.
Example: #define CUBE(X)(X*X*X)

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

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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.

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Reports an error: Undefined symbol X

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True, these macros are used for conditional operation.
#if
#elif
#endif

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Yes, the program prints “JavaTpoint” and runs infinitely.

The macro INFINITELOOP while(1) replaces the text INFINITELOOP by while(1)

In the main function, while(1) satisfies the while condition and it prints “JavaTpoint”. Then it comes to while(1) and the loop runs infinitely.

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

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No, the header files have any kind of extension.

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The macro MAN(x, y) ((x)>(y)) ? (x):(y); returns the biggest number of given two numbers.

Step 1: int i=10, j=5, k=0; The variable i, j, k are declared as an integer type and initialized to value 10, 5, 0 respectively.

Step 2: k = MAN(++i, j++); becomes,

=> k = ((++i)>(j++)) ? (++i):(j++);

=> k = ((11)>(5)) ? (12):(6);

=> k = 12

Step 3: printf(“%d, %d, %d “, i, j, k); It prints the variable i, j, k.

In the above macro step 2 the variable i value is increemented by 2 and variable j value is increemented by 1.

Hence the output of the program is 12, 6, 12