Question 1

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

Accepted Answer

When no precision modifier is specified, printf() defaults to printing six decimal positions for floating point numbers.

Question 2

What will the given code result in printf("
 you are"awesome " ");?
A)compile error
B)run-time error
C)you are "awesome"
D)you are awesome

Accepted Answer

The given code will print the text with quotes around "awesome" because the backslash (\) is used as an escape character to include the double quotes in the output string.

Question 3

What will be the output for the given code printf("
 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

Accepted Answer

The format specifier `%07d` tells the `printf` function to print the integer with a total width of 7 digits, padding with zeros on the left if necessary. Therefore, the number 1212 is printed as 0001212 to meet the total width requirement.

Question 4

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]

Accepted Answer

The correct prototype for the control string in scanf() is [=%[width][modifiers]type=], where width and modifiers are optional, and type specifies the data type to be read.

Question 5

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

Accepted Answer

The symbol * in the control string is optional and is used when the data should be read from the stream but ignored, meaning it won't be stored in any variable.

Question 6

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

Accepted Answer

scanf ignores any whitespace characters (including spaces, tabs, and newlines) when reading input for most conversion specifiers.

Question 7

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

Accepted Answer

Separating parameters with commas is a syntax requirement in many programming languages. If the read and write parameters are not separated by commas, it will result in a compile-time error because the compiler will not be able to understand the intended structure of the code.

Question 8

_____ is an optional argument that gives the maximum number of characters to be read.
A)modifiers
B)width
C)precision
D)length

Accepted Answer

The correct option is B) width. In the context of formatted input/output functions in programming languages like C++, the width argument specifies the maximum number of characters to be read or written, making it an optional argument to control input/output operations' character count.

Question 9

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

Accepted Answer

The format string "%5d%s %c" specifies that the input should be read as follows: first, up to five characters are read and interpreted as a decimal integer (this allows for integers with fewer than five digits, padded by spaces if necessary); then, a string is read (which can include spaces since it follows an integer); finally, a single character is read, which could be the first non-whitespace character following the string. There's no indication that this format string would cause a compile or run-time error, nor does it instruct to ignore any characters after reading the first five as a decimal.

Question 10

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

Accepted Answer

The correct value of i is 2 because scanf returns the number of input items successfully matched and assigned, which in this case are two integers, a and b.

Question 11

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

Accepted Answer

The answer of If the user enters 1 3.2 s,...

Question 12

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

Accepted Answer

scanf() returns the number of successfully matched and assigned input items. In this case, it will return 1 because it successfully matches and assigns the first input item (1) to the integer variable a.

Question 13

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

Accepted Answer

Using an incorrect specifier for the datatype being read typically results in a run-time error because the program will attempt to interpret the input data in a way that does not match its actual format, leading to unexpected behavior or crashes during execution.

Question 14

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);

Accepted Answer

The correct prototype for the scanf function is A) scanf("controlstring",arg1,arg2,arg3,….,argn); where "controlstring" specifies the type of input variables and the subsequent arguments are the variables that will store the inputs.

Question 15

What is the meaning of the following C statement? scanf("%[^
]s", ch);
A)read all character except new line
B)read all characters
C)read only new line character
D)syntax error

Accepted Answer

The format specifier "%[^
]s" tells scanf to read all characters entered by the user until a newline ('
') character is encountered, excluding the newline character itself.

Question 16

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

Accepted Answer

The type specifier 'G' in formatting (e.g., in printf or similar functions in various programming languages) is used for floating point numbers and automatically selects the shorter of decimal or exponential format, depending on the value and the precision specified.

Question 17

scanf() is a predefined function in______header file.
A)stdlib. h
B)ctype. h
C)stdio. h
D)stdarg. h

Accepted Answer

The `scanf()` function is defined in the `stdio.h` header file, which is used for input and output operations in C.

Question 18

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

Accepted Answer

The statement `scanf("%7s",ch);` specifies that a maximum of 7 characters will be read into the string `ch`. This prevents buffer overflow by limiting the number of characters read.

Quiz 2: Managing Io Operations

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

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

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

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

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

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

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

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

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

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

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

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

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

What is the prototype of scanf function?

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

What is the qualifying input for the type specifier G?

scanf() is a predefined function in______header file.

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