Interview Questions

1. What will happen when existing file is open using 'w' mode

Options:

a. Data added at end

b. Content of file deleted.

c. data of file is appended

d. data added in continuity

Reveal Answer

2. What is the default return-type of getchar()?

Options:

a. char

b. int

c. char *

d. Reading character doesn’t require a return-type

Reveal Answer

3. Which is the invalid I/O function in binary format?

Options:

a. Fseek

b. fwrite

c. fread

d. fgets

Reveal Answer

4. Which of the following do not give compilation error?

Options:

a. using file function with file pointer

b. access file with its pointer

c. open file in existence of it

d. read file that is in write mode

Reveal Answer

5. Which of the following is invalid i/o function?

Options:

a. fscanf

b. fseek

c. ftell

d. forward

Reveal Answer

6. Which function is used to read an integer value from a file?

Options:

a. getw

b. fscanf()

c. gets

d. geti

Reveal Answer

7. Which of following is used for representing End of the file?

Options:

a. '/0'

b. eof

c. EOF

d. garbage value

Reveal Answer

8. What is the data type and value of EOF?

Options:

a. int,1

b. int,-1

c. char,1

d. float 1

Reveal Answer

9. The mode r is used for reading the file, what will be the output if the file does not exist

Options:

a. returns NULL

b. new file created

c. compilation error

d. runtime error

Reveal Answer

10. What is function of mode 'a+' during opening the file?

Options:

a. Reading will start from beginning but writing data is added at end

b. Directly add the data at the end

c. data is overwritten

d. create file during in existence of file

Reveal Answer

11. A file must be opened before it can be used

Options:

a. True

b. False

Reveal Answer

12. All files must be explicitly closed

Options:

a. True

b. False

Reveal Answer

13. Files are always referred by file name in C

Options:

a. True

b. False

Reveal Answer

14. What will happen when existing file is open using 'w' mode?

Options:

a. Data is added at the end

b. Deletes the previous content and starts from beginning

c. Data of file is appended

d. Data added in continuity

Reveal Answer

15. Function fseek may be used to seek from the beginning of the file only

Options:

a. True

b. False

Reveal Answer

16. Which of the following is not a file Access mode

Options:

a. r+

b. w+

c. a-

d. a+

Reveal Answer

17. Which of the following file handling function is analogous to the standard I/O function printf?

Options:

a. fprint

b. fprintf

c. fprints

d. fprintline

Reveal Answer

18. Which of the following function is used to write an integer value to the file

Options:

a. fscanf()

b. fprintf()

c. putw()

d. puti()

Reveal Answer

19. What will be the output of following program? int main() { FILE *fp; fp=fopen("TRIAL.C","r"); fclose(fp); }

Options:

a. Error

b. Runtime error

c. File Open successfully

d. TRIAL.C

Reveal Answer

20. What will be the output of following program? int main() { FILE *fp; char str[20]; fp=fopen(strcpy(str, "ENGINE.C"),"w"); while(fgets(str,80,fp)!=EOF) puts(str); }

Options:

a. No output

b. 80

c. output

d. 80 w

Reveal Answer

21. What will be the output of following program? int main() { FILE *fp; char c; fp=fopen("TRY.C","r"); if(fp=NULL) { puts("Cannot Open File"); exit(1); } while((c = getc(fp))!=EOF) putch(c); fclose(fp); }

Options:

a. Compilation Error

b. Runtime Error

c. No Output

d. Abnormal Termination

Reveal Answer

22. What will be the output of following program? int main() { char name[20]; int age; printf("Enter name and age\n"); fscanf(stdin, "%s %d",name, &age); fprintf(stdout, "%s %d",name, age); }

Options:

a. Enter name and age John 22 John 22

b. John 22 John 22

c. Enter name and age Enter name and age

d. John 22

Reveal Answer

23. What will be the output of following program? int main() { static char name[20]="Triplet"; char s; s=name; while(s) { putc(s, stdout); fputchar(s); printf("%c\n",*s); s++; } }

Options:

a. TTT rrr iii ppp lll eee ttt

b. ppp lll eee ttt

c. TTT rrr iii ppp

d. lll eee

Reveal Answer

24. What will be the output of following program? int main() { struct a { char city[10]; int pin; }; static struct a b={"Hyderabad",20}; static char c[]="banglore"; FILE *fp; fp = fopen("Trial", "wb"); fwrite(&b, sizeof(b), 1, fp); fwrite(c, 9, 1, fp); }

Options:

a. Hyderabad

b. Hyderabad 20

c. banglore Trial

d. No output

Reveal Answer

25. Which of the following functions is most appropriate for storing numbers in a file?

Options:

a. putc()

b. fprintf()

c. fprintf()

Reveal Answer

26. Which of the following file opening modes would destroy the file being opened, if the file already exist on the disk?

Options:

a. "w"

b. "wb"

c. "rb+"

d. "ab+"

Reveal Answer

Interview Questions and Answer

1. What will happen when existing file is open using 'w' mode

2. What is the default return-type of getchar()?

3. Which is the invalid I/O function in binary format?

4. Which of the following do not give compilation error?

5. Which of the following is invalid i/o function?

6. Which function is used to read an integer value from a file?

7. Which of following is used for representing End of the file?

8. What is the data type and value of EOF?

9. The mode r is used for reading the file, what will be the output if the file does not exist

10. What is function of mode 'a+' during opening the file?

11. A file must be opened before it can be used

12. All files must be explicitly closed

13. Files are always referred by file name in C

14. What will happen when existing file is open using 'w' mode?

15. Function fseek may be used to seek from the beginning of the file only

16. Which of the following is not a file Access mode

17. Which of the following file handling function is analogous to the standard I/O function printf?

18. Which of the following function is used to write an integer value to the file

19. What will be the output of following program? int main() { FILE *fp; fp=fopen("TRIAL.C","r"); fclose(fp); }

20. What will be the output of following program? int main() { FILE *fp; char str[20]; fp=fopen(strcpy(str, "ENGINE.C"),"w"); while(fgets(str,80,fp)!=EOF) puts(str); }

21. What will be the output of following program? int main() { FILE *fp; char c; fp=fopen("TRY.C","r"); if(fp=NULL) { puts("Cannot Open File"); exit(1); } while((c = getc(fp))!=EOF) putch(c); fclose(fp); }

22. What will be the output of following program? int main() { char name[20]; int age; printf("Enter name and age\n"); fscanf(stdin, "%s %d",name, &age); fprintf(stdout, "%s %d",name, age); }

23. What will be the output of following program? int main() { static char name[20]="Triplet"; char s; s=name; while(s) { putc(s, stdout); fputchar(s); printf("%c\n",*s); s++; } }

24. What will be the output of following program? int main() { struct a { char city[10]; int pin; }; static struct a b={"Hyderabad",20}; static char c[]="banglore"; FILE *fp; fp = fopen("Trial", "wb"); fwrite(&b, sizeof(b), 1, fp); fwrite(c, 9, 1, fp); }

25. Which of the following functions is most appropriate for storing numbers in a file?

26. Which of the following file opening modes would destroy the file being opened, if the file already exist on the disk?

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