Interview Questions

1. Use of _______ header file provides functions and macros to implement the functionality of variable arguments.

Options:

a. Stdio.h

b. String.h

c. stdarg.h

d. ctype.h

Reveal Answer

2. Which stage the following code #include<stdio.h> gets replaced by the contents of the file stdio.h

Options:

a. During editing

b. During linking

c. During execution

d. During pre-processing

Reveal Answer

3. If the file to be included doesn't exist, the pre-processor displays an error message

Options:

a. True

b. False

Reveal Answer

4. Macro calls and function calls work exactly similarly.

Options:

a. True

b. False

Reveal Answer

5. In a macro call the control is passed to the macro.

Options:

a. True

b. False

Reveal Answer

6. A header file contains macros, structure declaration and function prototypes

Options:

a. True

b. False

Reveal Answer

7. A pre-processor directive is a message from compiler to a linker.

Options:

a. True

b. False

Reveal Answer

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

Options:

a. True

b. False

Reveal Answer

9. Preprocessor directive #ifdef .. #else ... #endif is used for conditional compilation.

Options:

a. True

b. False

Reveal Answer

10. Macros with arguments are allowed

Options:

a. True

b. False

Reveal Answer

11. What will be the output of the following program? #include<stdio.h> #define SI(p, n, r) float si; si=pnr/100; int main() { float p=2500, r=3.5; int n=3; SI(p, n, r); SI(1500, 2, 2.5); return 0; }

Options:

a. 26250.00 7500.00

b. None

c. Error: Multiple declaration of si

d. Garbage values

Reveal Answer

12. What will be the output of the following program #include<stdio.h> #define PRINT(int) printf("int=%d, ", int); int main() { int x=2, y=3, z=4; PRINT(x); PRINT(y); PRINT(z); return 0; }

Options:

a. int=2, int=3, int=4

b. int=2, int=2, int=2

c. int=3, int=3, int=3

d. int=4, int=4, int=4

Reveal Answer

13. What will be the output of the following program #include<stdio.h> #define MAX(a, b) (a > b ? a : b) int main() { int x; x = MAX(3+2, 2+7); printf("%d\n", x); return 0; }

Options:

a. 8

b. 9

c. 6

d. 5

Reveal Answer

14. What will be the output of the following program #include<stdio.h> #define MESS apple int main() { printf("MESS\n"); return 0; }

Options:

a. Mess

b. MESS

c. Apple

d. Nothing will print

Reveal Answer

15. What will be the output of the following program #include<stdio.h> #define DEF main() { int i=2; #ifdef DEF printf("Square of i=%d",i*i); #else printf("i=%d",i); #endif }

Options:

a. Square of i=4

b. i=2

c. compilation Error

d. None

Reveal Answer

16. What will be the output of the following program? #include<stdio.h> #define MESS(m) printf("m") main() { MESS("Welcome to the world of c"); MESS("C Videos"); }

Options:

a. Welcome to the world of c

b. Welcome to the world of c

c. mm

d. Welcome to the world of c C Videos

Reveal Answer

17. What will be the output of the following program? #define GOTONEXTLINE printf("\n") main() { printf("A Message"); GOTONEXTLINE ; printf("Life"); GOTONEXTLINE ; printf("goes on.."); }

Options:

a. A Message Life Goes on

b. A Message Life

c. A Message Life goes on...

d. A Message goes on.....

Reveal Answer

18. What will be the output of the following program? #define THIS #define THAT main() { #ifdef THIS && THAT printf("Definitions are hard to digest"); #else printf("But once mugges up,hard to forget"); #endif }

Options:

a. No Output

b. Error

c. But once mugges up,hard to forget

d. Definitions are hard to digest

Reveal Answer

19. What will be the output of the following program? #include<stdio.h> #define MEAN(a,b,c,d,e) (a+b+c+d+e)/5 Int main() { int a,b,c,d,e,m; a=1;b=2;c=3;d=4;e=5; m=MEAN(a,b,c,d,e); printf("Mean of the five numbers is=%d",m); }

Options:

a. Mean of the five numbers is=3

b. Mean of the five numbers is=5

c. None

d. Expression Syntax

Reveal Answer

20. What will be the output of the following program? #include<stdio.h> #define COND(a) (a>=65&&a<=90) main() { char ch='R'; if(COND(ch)) printf("ch is in upper case"); else printf("ch is in lower case"); }

Options:

a. ch is in upper case

b. ch is in lower case

c. Expression Syntax

d. None

Reveal Answer

21. What will be the output of the following program #include<stdio.h> #define print(int)printf("%d\n",int) Int main() { int x=3; print(x); }

Options:

a. 3

b. Garbage Value

c. 1

d. 0

Reveal Answer

Interview Questions and Answer

1. Use of _______ header file provides functions and macros to implement the functionality of variable arguments.

2. Which stage the following code #include<stdio.h> gets replaced by the contents of the file stdio.h

3. If the file to be included doesn't exist, the pre-processor displays an error message

4. Macro calls and function calls work exactly similarly.

5. In a macro call the control is passed to the macro.

6. A header file contains macros, structure declaration and function prototypes

7. A pre-processor directive is a message from compiler to a linker.

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

9. Preprocessor directive #ifdef .. #else ... #endif is used for conditional compilation.

10. Macros with arguments are allowed

11. What will be the output of the following program? #include<stdio.h> #define SI(p, n, r) float si; si=pnr/100; int main() { float p=2500, r=3.5; int n=3; SI(p, n, r); SI(1500, 2, 2.5); return 0; }

12. What will be the output of the following program #include<stdio.h> #define PRINT(int) printf("int=%d, ", int); int main() { int x=2, y=3, z=4; PRINT(x); PRINT(y); PRINT(z); return 0; }

13. What will be the output of the following program #include<stdio.h> #define MAX(a, b) (a > b ? a : b) int main() { int x; x = MAX(3+2, 2+7); printf("%d\n", x); return 0; }

14. What will be the output of the following program #include<stdio.h> #define MESS apple int main() { printf("MESS\n"); return 0; }

15. What will be the output of the following program #include<stdio.h> #define DEF main() { int i=2; #ifdef DEF printf("Square of i=%d",i*i); #else printf("i=%d",i); #endif }

16. What will be the output of the following program? #include<stdio.h> #define MESS(m) printf("m") main() { MESS("Welcome to the world of c"); MESS("C Videos"); }

17. What will be the output of the following program? #define GOTONEXTLINE printf("\n") main() { printf("A Message"); GOTONEXTLINE ; printf("Life"); GOTONEXTLINE ; printf("goes on.."); }

18. What will be the output of the following program? #define THIS #define THAT main() { #ifdef THIS && THAT printf("Definitions are hard to digest"); #else printf("But once mugges up,hard to forget"); #endif }

19. What will be the output of the following program? #include<stdio.h> #define MEAN(a,b,c,d,e) (a+b+c+d+e)/5 Int main() { int a,b,c,d,e,m; a=1;b=2;c=3;d=4;e=5; m=MEAN(a,b,c,d,e); printf("Mean of the five numbers is=%d",m); }

20. What will be the output of the following program? #include<stdio.h> #define COND(a) (a>=65&&a<=90) main() { char ch='R'; if(COND(ch)) printf("ch is in upper case"); else printf("ch is in lower case"); }

21. What will be the output of the following program #include<stdio.h> #define print(int)printf("%d\n",int) Int main() { int x=3; print(x); }

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