Quiz for File operations fprintf

Q1: What is the primary purpose of fprintf()?

A. To write formatted output to a file B. To read formatted input from a file C. To open a file D. To close a file

Q2: Which header file declares fprintf()?

A. <stdio.h> B. <stdlib.h> C. <string.h> D. <fcntl.h>

Q3: What is the return type of fprintf()?

A. int B. void C. char D. float

Q4: What does fprintf(fp, "%d", 100) do?

A. Writes "100" to the file pointed by fp B. Reads integer from file C. Closes the file D. Formats integer but does not write

Q5: Can fprintf() write strings to a file?

A. Yes, using format specifier %s B. No, only numbers C. Only characters D. Only binary data

Q6: What happens if fprintf() fails to write?

A. Returns a negative number B. Returns zero C. Throws exception D. Program terminates

Q7: Which of these is a valid fprintf() usage?

A. fprintf(fp, "Hello %s", "World") B. fprintf("Hello %s", fp) C. fprintf(fp, "Hello %d") D. fprintf("Hello World")

Q8: Can fprintf() be used for console output?

A. No, use printf() for console B. Yes, if fp is stdout C. Only with file D. Only with stderr

Q9: What format specifier prints a floating point number?

A. %f B. %d C. %c D. %s

Q10: Is fprintf() type-safe?

A. No, incorrect format specifiers lead to undefined behavior B. Yes, always safe C. Compiler checks all formats D. Errors are caught at runtime

Q11: Can fprintf() write multiple variables in one call?

A. Yes, using multiple format specifiers B. No, only one variable at a time C. Only strings D. Only integers

Q12: Which format specifier is used for a character?

A. %c B. %d C. %f D. %s

Q13: Can fprintf() write binary data?

A. No, it writes formatted text only B. Yes, always C. Only if format is %b D. Depends on compiler

Q14: What must be done before using fprintf()?

A. File must be opened with fopen() B. File must be closed C. File pointer must be NULL D. File must be created manually

Q15: Can fprintf() cause buffer overflow?

A. Yes, if format and data do not match B. No, always safe C. Only with large files D. Only on Linux

Q16: Is fprintf() thread-safe?

A. Not guaranteed, depends on implementation B. Yes, always C. No, never D. Only on Windows

Q17: What is the difference between fprintf() and printf()?

A. fprintf() writes to a file, printf() writes to console B. fprintf() reads files, printf() writes C. Both write to console D. Both read input

Q18: Which argument is mandatory for fprintf()?

A. FILE * stream B. Format string only C. Variable arguments only D. None

Q19: Can fprintf() write to stderr?

A. Yes, if stream is stderr B. No, only files C. Only stdout D. Only stdin

Q20: Does fprintf() add a newline automatically?

A. No, newline must be included in format B. Yes, always C. Sometimes D. Only with %n