C Programming – Standard Input & Output

C Programming - Standard Input & Output

Question 1

Which among the following is odd one out?

A	printf
B	fprintf
C	putchar
D	scanf

Question 2

 For a typical program, the input is taken using.

A	scanf
B	Files
C	Command-line
D	None of the mentioned

Question 3

What does the following command line signify?     prog1|prog2

A	It runs prog1 first, prog2 second
B	It runs prog2 first, prog1 second
C	It runs both the programs, pipes output of prog1 to input of prog2
D	It runs both the programs, pipes output of prog2 to input of prog1

Question 4

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

A	char
B	int
C	char *
D	Reading character doesn’t require a return-type

Question 5

The value of EOF is_____.

A	-1
B	0
C	1
D	10

Question 6

What is the use of getchar()?

A	The next input character each time it is called
B	EOF when it encounters end of file.
C	Both a & b
D	None of the mentioned

Question 7

Which is true?

A	The symbolic constant EOF is defined in
B	The value is typically -1,
C	Both a & b
D	Either a or b

Question 8

What is the use of putchar()?

A	The character written
B	EOF is an error occurs
C	Nothing
D	Both a & b

Question 9

Which is true about function tolower?

A	The function tolower is defined in
B	Converts an upper case letter to lower case
C	returns other characters untouched
D	None of the mentioned

Question 10

What is the output of this C code?

    #include 
    int main()
    {
    char c = '�';
    putchar(c);
    }

A	Compile time error
B	Nothing
C	0
D	Undefined behaviour

Question 11

 putchar(c) function/macro always outputs character c to the

A	screen
B	standard output
C	depends on the compiler
D	Depends on the standard

Question 12

What is the output of this C code if following commands are used to run(considering myfile exists)? gcc -otest test.c ./test < myfile

    #include 
    int main()
    {
    char c = 'd';
    putchar(c);
    }

A	Compile time error (after first command)
B	d in the myfile file
C	d on the screen
D	Undefined behaviour

Question 13

What is the output of this C code if following commands are used to run(considering myfile exists)? gcc -otest test.c ./test > myfile

    #include 
    int main(int argc, char **argv)
    {
    char c = 'd';
    putchar(c);
    printf(" %d\n", argc);
    }

A	d 2 in myfile
B	d 1 in myfile
C	d in myfile and 1 in screen
D	d in myfile and 2 in screen

Question 14

What is the output of this C code if following commands are used to run and if myfile does not exist? gcc -o test test.c ./test > myfile

    #include 
    int main(int argc, char **argv)
    {
    char c = 'd';
    putchar(c);
    printf(" %d\n", argc);
    } 

A	d 2 in myfile
B	d 1 in myfile
C	Depends on the system
D	Depends on the standard

Question 15

 The statement prog <infile causes

A	prog to read characters from infile.
B	prog to write characters to infile.
C	infile to read characters from prog instead.
D	Nothing

Check Your Answers:

  1. D

  2. D

  3. C

  4. B

  5. A

  6. C

  7. C

  8. D

  9. D

10. B

11. B

12. C

13. B

14. B

15. A

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