Preprocessor And Macros in C language MCQs

Questions

1. What is the output of this program? #include <stdio.h> #define int char main() { int i=50; printf ("sizeof (i) =%d", sizeof (i)); }

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; }

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; }

4. What is the output of this program? #include <stdio.h> #define i 5 int main() { #define i 10 printf("%d",i); return 0; }

5. What is the output of this program? #include <stdio.h> #define clrscr() 17 int main() { clrscr(); printf("%d",clrscr()); return 0; }

6. What is the output of this program? #include <stdio.h> int main() { printf("%d",30); return 0; }

7. What is the output of this program? #include <stdio.h> #define p 17; int main() { printf("%d",p); return 0; }

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; }

9. What is the Error of this program? #include <stdio.h> #define CONDITION(x) printf("letsfindcourse"); int main() { CONDITION(0); return 0; }

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; }

11. What is a preprocessor directive

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

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

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

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

16. Macros with arguments are not allowed.

17. Nested macros are allowed.

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

19. All macro substitutions in a program are done?

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

21. Identify the trigraph sequence for .

22. Identify the trigraph sequence for^.

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

24. Undefined function calls in a C program.

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

26. va_list is

27. The following line in a program # represents

28. Identify the stringizing operator.

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

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

Index of Questions