Quiz for Reading and writing text files

Q1: Which function is used to open a text file for reading?

A. fopen() with mode "r" B. fopen() with mode "w" C. fopen() with mode "a" D. fopen() with mode "r+"

Q2: Which function reads a line from a text file?

A. fgets() B. fputc() C. fscanf() D. fgets() reads a line, fputc() writes a character.

Q3: Which function writes a string to a text file?

A. fputs() B. fgets() C. fscanf() D. fgetc()

Q4: What is the difference between fprintf() and fputs()?

A. fprintf() formats output, fputs() writes string as-is B. fprintf() writes binary, fputs() writes text C. No difference D. Both read data

Q5: Which function reads formatted input from a file?

A. fscanf() B. fgets() C. fread() D. fwrite()

Q6: Which function writes formatted output to a file?

A. fprintf() B. fputs() C. fwrite() D. fread()

Q7: How to close a file after reading or writing?

A. fclose() B. fflush() C. close() D. fend()

Q8: Which function reads a single character from a file?

A. fgetc() B. putc() C. fgets() D. fputc()

Q9: Which function writes a single character to a file?

A. fputc() B. fgetc() C. fputs() D. fgets()

Q10: How to append data to an existing text file?

A. Open file with mode "a" B. Open file with mode "r" C. Open file with mode "w" D. Open file with mode "r+"

Q11: What does fgets() return when it reaches end of file?

A. NULL B. EOF C. 0 D. Empty string

Q12: Which function can be used to read a block of data?

A. fread() B. fgets() C. fscanf() D. fputc()

Q13: Which function writes a block of data?

A. fwrite() B. fputs() C. fscanf() D. fgetc()

Q14: Can fscanf() be used to read integers from a text file?

A. Yes, using format specifiers like %d B. No, only strings C. No, only characters D. No, only floating point

Q15: What happens if you write to a file opened in "r" mode?

A. Undefined behavior, likely error B. Data will be appended C. File will be overwritten D. Nothing happens

Q16: How to move file pointer to beginning?

A. Use rewind(fp) B. Use fseek(fp, 0, SEEK_END) C. Use fclose() D. Use fflush()

Q17: Which function returns EOF on error or end of file?

A. fgetc() B. fputc() C. fputs() D. fscanf()

Q18: Is text file reading line-oriented or binary?

A. Line-oriented B. Binary only C. Both D. None

Q19: Which function is safer for reading strings from files to avoid buffer overflow?

A. fgets() B. fscanf() C. fread() D. fgetc()