C Programming Multiple Choice Question - Preprocessor And Macros

This section focuses on the "Preprocessor And Macros" of the C programming. These Multiple Choice Questions (mcq) should be practiced to improve the C programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. What is the output of this program?

        
#include <stdio.h>
#define int char
main()
{
  int i=50;
  printf ("sizeof (i) =%d", sizeof (i));
}

A. 2
B. 4
C. 8
D. 1

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2. What is the output of this program?

#include <stdio.h> 
#define x 3
int main()
{
  int i;
  i = x*x*x;
  printf("%d",i);
  return 0;
}

A. 27
B. x is not declared
C. No output
D. Garbage value

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3. What is the output of this program?

#include <stdio.h> 
#include  <stdlib.h>
#define square(x) x*x
int main()
{
  int i;
  i = 27/square(3);
  printf("%d",i);
  return 0;
}

A. 9
B. Compilation error
C. 3
D. 27

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4. What is the output of this program?

#include <stdio.h>
#define i 5
int main()
{
  #define i 10
  printf("%d",i);
  return 0;
}

A. Compilation error
B. 10
C. 5
D. Runtime error

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5. What is the output of this program?

#include <stdio.h>
#define clrscr() 17
int main()
{
  clrscr();
  printf("%d",clrscr());
  return 0;
}

A. Compilation error
B. Runtime error
C. 17
D. none of the above

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6. What is the output of this program?

		   
#include <stdio.h>
int main()
{
  printf("%d",30);
  return 0;
}

A. Runtime Error
B. Garbage value
C. Compilation error
D. 30

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7. What is the output of this program?

#include <stdio.h>
#define p 17;
int main()
{
  printf("%d",p);
  return 0;
}

A. Garbage value
B. Runtime error
C. 17
D. Compilation error

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8. Which statment is true about the given code ?

#include <stdio.h>
enum colors {lets,find,course};
int main()
{
  printf("%d %d %d",course,lets,find);
  return 0;
}

A. 3 1 2
B. 0 1 2
C. 2 0 1
D. 1 0 2

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9. What is the Error of this program?

#include <stdio.h>
#define CONDITION(x) 
printf("letsfindcourse");                         
int main()
{
  CONDITION(0);
  return 0;
}

A. letsfindcourse
B. Compilation error
C. Runtime error
D. None of the above

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10. How will you free the memory allocated by the following program?

#include <stdio.h>
#define CONDITION(x)
printf("letsfindcourse");                         
int main()
{
  CONDITION(0);
  return 0;
}

A. Runtime Error
B. letsfindcourse
C. Compilation error
D. None of the above

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11. What is a preprocessor directive

A. a message from compiler to the programmer
B. a message from programmer to the microprocessor
C. a message from programmer to the preprocessor
D. a message from compiler to the linker

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12. Which of the following are correctly formed #define statements?

A. #define INCH PER FEET 12
B. #define SQR(X) (X *X);
C. #define SQR(X) X*X
D. #define SQR(X) (X*X)

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13. A macro must always be written in capital letters.

A. TRUE
B. May Be
C. FALSE
D. Can't Say

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14. A macro should always be accommodated in a single line.

A. TRUE
B. May Be
C. FALSE
D. Can't Say

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15. After preprocessing when the program is sent for compilation the macros are removed from the expanded source code.

A. TRUE
B. FALSE
C. Can be true or false
D. Can't Say

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16. Macros with arguments are not allowed.

A. TRUE
B. May Be
C. FALSE
D. Can't Say

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17. Nested macros are allowed.

A. TRUE
B. May Be
C. FALSE
D. Can't Say

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18. Tn a macro call the control is passed to the macro.

A. TRUE
B. FALSE
C. May Be
D. Can't Say

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19. All macro substitutions in a program are done?

A. Before compilation of the program.
B. During execution
C. After compilation
D. None of the above

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20. In a program the statement: #include "filename" is replaced by the contents of the file "filename"?

A. Before compilation
B. During execution
C. After Compilation
D. None of the above

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21. Identify the trigraph sequence for .

A. ??/
B. ??=
C. ??
D. ??!

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22. Identify the trigraph sequence for^.

A. ??/
B. ??=
C. ??
D. ??!

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23. What is the output generated by the following code?
    #define square (a) (a*a)     printf("%d", square (4+5) ) ;

A. 81
B. 4
C. 29
D. None of the above.

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24. Undefined function calls in a C program.

A. by the preprocessor
B. by the linker
C. by the assembler
D. by the operating system are detected

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25. Identify the macro(s) defined in stdarg.h.

A. va_start
B. va_end
C. va_arg
D. all the above

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26. va_list is

A. a macro defined in stdarg.h
B. a predefined data type in stdarg.h
C. a macro defined in stdlib.h
D. a predefined data type stdlib.h.

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27. The following line in a program # represents

A. an invalid code
B. a null directive
C. a comment
D. a page number

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28. Identify the stringizing operator.

A. +
B. ::
C. #
D. ##

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29. The EOF character can be included in a file as part of its data

A. TRUE
B. May Be
C. FALSE
D. Can't Say

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30. The NULL character indicates an end of a string and a file.

A. TRUE
B. May Be
C. FALSE
D. Can't Say

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