Deck 2: Managing Io Operations

Question 1

Which among the following is the odd one out?

A)printf
B)fprintf
C)putchar
D)scanf

Answer 1

scanf

Question 2

For a typical program, the input is taken using _________

A)scanf
B)Files
C)Command-line
D)All of the mentioned

Answer 2

All 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

Answer 3

It runs both the programs, pipes output of prog1 to input of prog2

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

What is the value of EOF?

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

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

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

Question 9

Escape sequences are prefixed with ________

A)%
B)/
C)"
D)None of the mentioned

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

Question 11

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

A)%
B)\%
C)'%'
D)%%

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

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

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

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

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

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

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

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

Question 20

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

A)
B)
C)
D)

Question 21

What is the purpose of va_end?

A)Cleanup is necessary
B)Must be called before the program returns
C)Cleanup is necessary & Must be called before the program returns
D)None of the mentioned

Question 22

Which of the following is NOT a delimiter for an input in scanf?

A)Enter
B)Space
C)Tab
D)None of the mentioned

Question 23

If the conversion characters of int d, i, o, u and x are preceded by h, it indicates?

A)A pointer to int
B)A pointer to short
C)A pointer to long
D)A pointer to char

Question 24

Which of the following doesn't require an & for the input in scanf()?

A)char name[10];
B)int name[10];
C)float name[10];
D)all of the mentioned

Question 25

Which of the following is an invalid method for input?

A)scanf("%d%d%d",&a, &b, &c);
B)scanf("%d %d %d", &a, &b, &c);
C)scanf("Three values are %d %d %d",&a,&b,&c);
D)none of the mentioned

Question 26

Which of the following represents the function for scanf()?

A)void scanf(char *format, …)
B)int scanf(char *format, …)
C)char scanf(int format, …)
D)char *scanf(char *format, …)

Question 27

What does scanf() function return?

A)Number of successfully matched and assigned input items
B)Nothing
C)Number of characters properly printed
D)Error

Question 28

The conversion characters d, i, o, u, and x may be preceded by h in scanf() to indicate?

A)A pointer to short
B)A pointer to long
C)Nothing
D)Error

Question 29

The syntax of printf() function is printf("control string", variable list) ;what is the prototype of the control string?

A)%[flags][.precision][width][length]specifier
B)%[flags][length][width][.precision]specifier
C)%[flags][width][.precision][length]specifier
D)%[flags][.precision][length][width]specifier

Question 30

The parameter control string in the printf () is a C String that contains text to be __________

A)taken from a standard output device
B)written on to the standard output device
C)received from the standard output device
D)nothing can be said

Question 31

Output justification such as decimal point, numerical sign, trailing zeros or octal are specified.

A)specifier
B)flags
C)precision
D)decimal

Question 32

What symbol is used to Left-justify within the data given field width?

A)-(minus sign)
B)+(plus sign)
C)#
D)0

Question 33

What specifies the minimum number of characters to print after being padded with zeros or blank spaces?

A)flags
B)length
C)width
D)precision

Question 34

The maximum number of characters to be printed is specified by __________

A)precision
B)width
C)length
D)flags

Question 35

________is used to define the type and the interpretation of the value of the corresponding argument.

A)precision
B)specifiers
C)flags
D)decimal

Question 36

A conversion specification %7.4f means ____________

A)print a floating point value of maximum 7 digits where 4 digits are allotted for the digits after the decimal point
B)print a floating point value of maximum 4 digits where 7digits are allotted for the digits after the decimal point
C)print a floating point value of maximum 7 digits
D)print a floating point value of minimum 7 digits where 4 digits are allotted for the digits after the decimal point

Question 37

Choose the correct description for control string %-+7.2f.

A)- means display the sign, + means left justify, 7 specifies the width and 2 specifies the precision
B)- means left justify, + means display the sign, 7 specifies the width and 2 specifies the precision
C)- means display the sign, + means left justify, 7 specifies the precision and 2 specifies the width
D)- means left justify, + means display the sign, 7 specifies the precision and 2 specifies the width

Question 38

What error is generated on placing an address operator with a variable in the printf statement?

A)compile error
B)run-time error
C)logical error
D)no error

Question 39

If by mistake you specify more number of arguments, the excess arguments will ____________

A)be ignored
B)produce compile error
C)produce run-time error
D)produce logical error

Question 40

What happens when zero flag is used with left justification?

A)data is padded with zeros
B)zero flag is ignored
C)data is padded with blank spaces
D)will give error

Question 41

For floating point numbers, the precision flag specifies the number of decimal places to be printed. When no precision modifier is specified, printf() prints _______

A)six decimal positions
B)five decimal positions
C)four decimal positions
D)three decimal positions

Question 42

What will the given code result in printf("\n you are\"awesome \" ");?

A)compile error
B)run-time error
C)you are "awesome"
D)you are awesome

Question 43

What will be the output for the given code printf("\n The number is %07d",1212);

A)The number is 0001212
B)The number is 1212
C)The number is 1212.
D)The number is 1212000

Question 44

The syntax of the scanf() is scanf("control string ", arg1,arg2,arg3,….,argn); the prototype of control string is ____________

A)[=%[width][modifiers]type=]
B)[=%[modifiers][width]type=]
C)[=%[width] [modifiers]]
D)[width][modifiers]

Question 45

What is the use of symbol * in the control string as shown [=%[*][width] [modifiers] type=]?

A)* is optional and used when the data should be read from the stream but ignored
B)* is not optional, used to read data from the stream but it is not ignored
C)* is not optional, it is used to read data stream but ignored
D)* is optional and used to read data from stream but it is not ignored

Question 46

What action is carried out by scanf if a user enters any blank spaces, tabs, and newlines?

A)consider as input
B)ignores it
C)produces error
D)nothing can be said

Question 47

What error will generate if the read and write parameters are not separated by commas?

A)run-time error
B)compile error
C)logical error
D)no error

Question 48

_____ is an optional argument that gives the maximum number of characters to be read.

A)modifiers
B)width
C)precision
D)length

Question 49

Explain the format string "%5d%s %c"

A)five characters as a decimal integer, then reads the remaining as a string and then scans the first non-whitespace character
B)compile error
C)run-time error
D)read first five characters as a decimal and ignore the rest

Question 50

Select the correct value of i from given options i=scanf("%d %d", &a, &b);

A)1
B)2
C)3
D)No value assigned

Question 51

If the user enters 1 3.2 s, what value will be returned by the scanf()?scanf("%d %f %c", &s1, &s2, &s3);

A)1
B)2
C)3
D)No return value

Question 52

If the user enters 1 s 3.2, what value will be returned by the scanf()?scanf("%d %f %c", &a, &b, &c);

A)1
B)2
C)3
D)no return value

Question 53

What error will be generated on using incorrect specifier for the datatype being read?

A)compile error
B)run-time error
C)logical error
D)no error

Question 54

What is the prototype of scanf function?

A)scanf("controlstring",arg1,arg2,arg3,….,argn);
B)scanf("control string", variable list);
C)scanf(" varible list,", control string);
D)scanf("arg1,arg2,arg3,….,argn", control string);

Question 55

What is the meaning of the following C statement? scanf("%[^\n]s", ch);

A)read all character except new line
B)read all characters
C)read only new line character
D)syntax error

Question 56

What is the qualifying input for the type specifier G?

A)floating point numbers
B)floating point numbers in exponential format
C)floating point numbers in the shorter of exponential format
D)not a type specifier

Question 57

scanf() is a predefined function in______header file.

A)stdlib. h
B)ctype. h
C)stdio. h
D)stdarg. h

Question 58

What does the C statement given below says? scanf("%7s",ch);

A)read string with minimum 7 characters.
B)read string with maximum 7 characters
C)read string exactly to 7 characters
D)read string with any number of characters