Question 1

Which among the following is the odd one out?
A)printf
B)fprintf
C)putchar
D)scanf

Accepted Answer

scanf is the odd one out because it is used for input, whereas printf, fprintf, and putchar are used for output.

Question 2

For a typical program, the input is taken using _________
A)scanf
B)Files
C)Command-line
D)All of the mentioned

Accepted Answer

All of the mentioned options, scanf, Files, and Command-line, are common methods for taking input in a program.

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

Accepted Answer

The command signifies that the output of prog1 is being piped as input to prog2, which is a common use of piping in command line operations.

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

Accepted Answer

getchar() returns the character read as an unsigned char cast to an int or EOF on end of file or error.

Question 5

What is the value of EOF?
A)-1
B)0
C)1
D)10

Accepted Answer

EOF, or End Of File, is a condition in computing that indicates no more data can be read from a data source. In many programming languages and environments, EOF is represented by the value -1.

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)The next input character each time it is called EOF when it encounters end of file
D)None of the mentioned

Accepted Answer

The function getchar() is used to read the next input character from a text stream and returns EOF when it encounters the end of the file. This makes option C correct as it combines both functionalities mentioned in options A and B.

Question 7

Which of the following statement is true? A)The symbolic constant EOF is defined in B)The value is -1 C)The symbolic constant EOF is defined in & value is -1 D)Only value is -1

Accepted Answer

EOF is a symbolic constant defined in the <stdio.h> header file with a value of -1, indicating the end of a file or an input error.

Question 8

What is the return value of putchar()?
A)The character written
B)EOF if an error occurs
C)Nothing
D)Both character written & EOF if an error occurs

Accepted Answer

The return value of putchar() is the character written if successful, and EOF if an error occurs. This means it can return both the character written and EOF, making option D correct.

Question 9

Escape sequences are prefixed with ________
A)%
B)/
C)"
D)None of the mentioned

Accepted Answer

Escape sequences in many programming languages, including C, C++, and Python, are prefixed with a backslash (\), not any of the symbols provided in the options.

Question 10

What is the purpose of sprintf?
A)It prints the data into stdout
B)It writes the formatted data into a string
C)It writes the formatted data into a file
D)None of the mentioned

Accepted Answer

The purpose of sprintf is to write formatted data into a string. Unlike printf, which prints data to stdout, sprintf saves the formatted output to a string variable.

Question 11

The syntax to print a % using printf statement can be done by ________
A)%
B)\%
C)'%'
D)%%

Accepted Answer

To print a percent sign (%) using printf in C or C++, you use '%%'. This is because a single % acts as a prefix to format specifiers, so '%%' is the way to escape it and print a literal percent sign.

Question 12

What are the Properties of the first argument of a printf() functions?
A)It is defined by a user
B)It keeps the record of the types of arguments that will follow
C)There may no be first argument
D)None of the mentioned

Accepted Answer

The first argument of a printf() function is a format string that specifies how to format and display the output. It includes placeholders that correspond to the types of the subsequent arguments, thereby keeping a record of the types of arguments that will follow.

Question 13

Which of the following function with ellipsis are illegal?
A)void func(…);
B)void func(int, …);
C)void func(int, int, …);
D)none of the mentioned

Accepted Answer

The ellipsis must be preceded by at least one parameter of a fixed type, so option A is illegal.

Question 14

Which of the following data-types are promoted when used as a parameter for an ellipsis?
A)char
B)short
C)int
D)none of the mentioned

Accepted Answer

The answer of Which of the following data-types are promoted...

Question 15

Which header file includes a function for variable number of arguments?
A)stdlib.h
B)stdarg.h
C)ctype.h
D)both stdlib.h and stdarg.h

Accepted Answer

The answer of Which header file includes a function for...

Question 16

Which of the following macro extracts an argument from the variable argument list (ie ellipsis) and advance the pointer to the next argument?
A)va_list
B)va_arg
C)va_end
D)va_start

Accepted Answer

va_arg is used to retrieve the next argument in a variable argument list.

Question 17

The type va_list in an argument list is used ________
A)To declare a variable that will refer to each argument in turn;
B)For cleanup
C)To create a list
D)There is no such type

Accepted Answer

The type va_list in an argument list is used to declare a variable that will refer to each argument in turn, especially in functions that accept a variable number of arguments.

Question 18

In a variable length argument function, the declaration "…" can _______
A)Appear anywhere in the function declaration
B)Only appear at the end of an argument list
C)Nothing
D)None of the mentioned

Accepted Answer

The declaration "…" indicating a variable length argument list can only appear at the end of an argument list in a function declaration. This allows the function to accept an undefined number of arguments.

Question 19

Each call of va_arg _______
A)Returns one argument
B)Steps va_list variable to the next
C)Returns one argument & Steps va_list variable to the next
D)None of the mentioned

Accepted Answer

Each call of va_arg returns one argument and steps the va_list variable to the next argument in the list.

Question 20

The standard header _______ is used for variable list arguments (…) in C. A) B) C) D)

Accepted Answer

The standard header <stdarg.h> is used for handling variable list arguments (…) in C, providing macros to access the variable arguments passed to functions.

Quiz 2: Managing Io Operations

Which among the following is the odd one out?

For a typical program, the input is taken using _________

What does the following command line signify? prog1 prog2

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

What is the value of EOF?

What is the use of getchar() ?

Which of the following statement is true?

What is the return value of putchar() ?

Escape sequences are prefixed with ________

What is the purpose of sprintf?

The syntax to print a % using printf statement can be done by ________

What are the Properties of the first argument of a printf() functions?

Which of the following function with ellipsis are illegal?

Which of the following data-types are promoted when used as a parameter for an ellipsis?

Which header file includes a function for variable number of arguments?

Which of the following macro extracts an argument from the variable argument list (ie ellipsis) and advance the pointer to the next argument?

The type va_list in an argument list is used ________

In a variable length argument function, the declaration "…" can _______

Each call of va_arg _______

The standard header _______ is used for variable list arguments (…) in C.