10

Question 1

What is the function prototype for getchar?

Answer 1

int getchar(void);

Question 2

What does getchar do?

Answer 2

Gets a single character from stdin.

Question 3

What is the function prototype for putchar?

Answer 3

int putchar(int c);

Question 4

What does putchar do?

Answer 4

Prints a single character to stdout.

Question 5

What does putchar do if it is not given an unsigned char?

Answer 5

It returns an error value.

Question 6

What does getchar return when it reaches the end of input?

Answer 6

EOF. This is a macro and may vary across platforms.

Question 7

What is the return value of fopen?

Answer 7

FILE*

Question 8

What are the three modes of file access?

Answer 8

‘r’, ‘w’, ‘a’

Question 9

What is the ‘r’ mode of file access used for?

Answer 9

Reading.

Question 10

What is the ‘w’ mode of file access used for?

Answer 10

Writing.

Question 11

What is the ‘a’ mode of file access used for?

Answer 11

Appending data to a file.

Question 12

What is the difference between ‘write’ and ‘append’ mode?

Answer 12

Write deletes the contents of the file if it already exists, whereas append starts writing to the end of the file.

Question 13

What function is used to close a FILE*?

Answer 13

fclose

Question 14

What is the function prototype for fclose?

Answer 14

int fclose(FILE *fp);

Question 15

What is the function prototype for fopen?

Answer 15

FILE* fopen(const char* fname, const char* mode);

Question 16

Which one of these is the correct function for writing a character to a file?
fputc
fputchar

Answer 16

fputc

Question 17

Which one of these is the correct function for reading a character from a file?
fgetc
fgetchar

Answer 17

fgetc

Question 18

What is the data type of stdin, stdout and stderr?

Answer 18

FILE*

Question 19

What is the function prototype for ungetc?

Answer 19

int ungetc(int char, FILE* stream);

Question 20

What does the function ‘ungetc’ do?

Answer 20

It returns a single character back into a stream. Useful for parsers etc.

Question 21

What does feof do?

Answer 21

Returns zero if the stream is at the end of the file.

Question 22

Which of these three streams in unbuffered?
stdin
stdout
stderr

Answer 22

stderr

Question 23

How are each of these streams buffered?
stdin
stdout
stderr

Answer 23

stdin and stdout are both line-buffered.

stderr is unbuffered.

Question 24

What does the fflush function do?

Answer 24

Flushes the buffer of a FILE*

Question 25

What does the function strerror do?

Answer 25

It takes in an errornumber and returns a string describing the error.

Question 26

What does the function perror do?

Answer 26

Prints a message to the error stream along with the current error message.

Question 27

What are bitfields?

Answer 27

When you specify how many bits a number will take up when you declare them.

Question 28

What are the three main ways of exiting a program?

Answer 28

• Reaching the end of main
• abort()
• exit(int status)