Chapter 9 – C How to Program 6e Multiple Choice Test Bank

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9.1 Introduction

9.1 Which function does not use either the standard input stream or the standard output stream?
a) puts
b) getchar
c) gettime
d) scanf

9.2 Streams

9.2 Which of the following is not a standard C formatted stream?
(a) standard input stream
(b) standard error stream
(c) standard output stream
(d) standard redirection stream

9.3 Which statement about the standard streams is true?
a) The standard input stream must be connected to the keyboard.
b) The standard output stream must be connected to the screen.
c) The standard error stream is connected to the screen by default.
d) Streams may not be redirected.

9.3 Formatting Output with printf
9.4 Which of the following does not represent a capability of the printf function?
(a) center justification of outputs
(b) left justification of outputs
(c) right justification of outputs
(d) inserting literal characters at precise locations in a line of output

9.5 Which is not a part of a format control string?
a) conversion specifiers
b) flags
c) field widths
d) printf

9.6 Which is not a formatting capability of printf?
a) left justification
b) centering
c) right justification
d) aligning a column of numbers so that decimal appoints appear one above the other

9.7 Which is not a formatting capability of printf?
a) representing unsigned integers in binary format
b) representing unsigned integers in decimal format
c) representing unsigned integers in hexadecimal format
d) representing unsigned integers in octal format

9.8 A printf format control string must be enclosed in
a) slashes
b) /* */
c) single quotes
d) double quotes

9.4 Printing Integers

9.9 Which statement about the i and d integer conversion specifiers is false?
a) They display a signed decimal integer (when used with printf).
b) They are identical when used with printf.
c) They are identical when used with scanf.
d) They display numbers without a decimal point.

9.10 Which integer conversion specifier displays an unsigned octal integer?
a) oct
b) OCT
c) o (lowercase letter)
d) O (uppercase letter)

9.11 Which integer conversion specifier displays an unsigned decimal integer?
a) u
b) U
c) ud
d) UD

9.12 Which integer conversion specifier would display the hexadecimal digit A?
a) h
b) H
c) x
d) X

9.13 When used with integer conversion specifiers, the letters h and l (“el”) are called __________.
a) height modifiers
b) length modifiers
c) complements
d) adjustors

9.14 Place __________ before any integer conversion specifier to indicate that a short integer is to be displayed.
a) s
b) S
c) h
d) H

9.15 Which statement about integer conversion specifiers is false?
a) It is an error to print a negative value with a conversion specifier that expects an unsigned value.
b) –455 when printed with %u prints 455.
c) When printing an integers with %d, the plus sign (on a positive integer) does not print.
d) Place an l (“el”) before any integer conversion specifier to indicate that a long integer is displayed.

9.5 Printing Floating-Point Numbers

9.16 The %e conversion specifier displays ________ values.
(a) long
(b) character
(c) integer
(d) floating-point

9.17 The %g conversion specifier indicates ________.
(a) color
(b) significant digits
(c) a global variable
(d) a hexadecimal integer

9.18 A floating-point value always contains a __________.
a) decimal point
b) comma
c) plus sign
d) e or E

9.19 The floating-point conversion specifiers e and E display floating-point values in __________ notation.
a) elliptical
b) existential
c) exponential
d) exportable

9.20 In 1.504582E+02, the E+02 indicates that __________.
a) 1.504582 is to be raised to the second power
b) 1.504582 is to be extended by two print positions
c) 1.504582 is to be multiplied by 100
d) 1.504582 is to be doubled

9.21 Values printed with the conversion specifiers e, E and f are output with __________ digits of precision to the right of the decimal point by default.
a) 0
b) 1
c) 5
d) 6

9.22 Conversion specifiers e and E always print exactly __________ to the left of the decimal point.
a) zero digits
b) one digit
c) two digits
d) three digits

9.23 Conversion specifiers g or G always print __________.
a) no trailing zeros
b) one trailing zero
c) as many trailing zeros as are in the number itself
d) a default of six trailing zeros

9.24 With the %g conversion specifier, the value 0.0000875 prints as
a) 8.75e-05
b) 87.5e-06
c) 0.875e-04
d) 0 (because of truncation)

9.6 Printing Strings and Characters

9.25 What would be the output of the following statements?

char* value = “hello”;
printf( “%c”, value );

(a) h
(b) hello
(c) value
(d) none of these

9.26 What would be the output of the following statement?

char* value = ‘hello’;
printf( ‘%s’, value );

(a) h
(b) hello
(c) value
(d) none of these

9.27 Conversion specifier c requires a(n) __________ argument.
a) pointer to char
b) char
c) integer
d) ASCII numeric

9.28 Conversion specifier s requires a(n) __________ argument.
a) pointer to char
b) char
c) integer
d) ASCII numeric

9.29 Which is not a common programming error with regard to the character and string conversion specifiers.
a) Using %c to print a string.
b) Using %s to print a char argument
c) Using double quotes around a character string
d) Using double quotes around a character constant

9.7 Other Conversion Specifiers

9.30 Which of the following would output a “%” sign when used in the format control string of the printf statement?
(a) %/
(b) /%
(c) %%
(d) none of these

9.31 Conversion specifier p __________.
a) displays a pointer value with -> notation
b) displays a pointer value in hexadecimal notation
c) displays a pointer value in decimal notation
d) displays a pointer value in an implementation-defined manner.

9.8 Printing with Field Widths and Precision

9.32 What does the 4 signify in the follwing statement?

printf( “%4i\n”, 123 );

(a) degree of exponentiation
(b) floating point precision
(c) a field width
(d) none of these

9.33 What would be the output of the following statement?
printf( “%4d”, 123456 );
(a) 1234
(b) 2345
(c) 3456
(d) none of these

9.34 The statement

printf( “%*.*f”, 7, 2, 98.736 );

uses _______ for the precision, __________ for the field width and outputs the value 98.74 __________.
a) 7, 2, left justified
b) 2, 7, left justified
c) 2, 7, right justified
d) 7, 2, right justified

9.35 If the field width is larger than the data being printed, the data will normally be __________ within that field.
a) truncated
b) right justified
c) centered
d) left justified

9.9 Using Flags in the printf Format-Control String

9.36 Which of the following is not a flag that can be used in the printf format-control string?
(a) 0
(b) +
(c) /
(d) #

9.37 Which of the following is the correct way to output the value of 4 left justified?
(a) printf( “%i”, 4 );
(b) printf( “%-i”, 4 );
(c) printf( “4%i”, 4 );
(d) printf( “4-%i”, 4 );

9.38 Which is not a format control string flag?
a) –
b) space
c) newline
d) #

9.39 Which statement is false with regard to format control string flags?
a) The plus sign is only displayed when the + flag is used.
b) The minus sign is always displayed (when the value being printed is negative).
c) To use a flag in a format control string, place the flag immediately to the left of the percent sign.
d) Use the 0 flag to pad a field with leading zeros.

9.10 Printing Literals and Escape Sequences
9.40 Which of the following is not an escape sequence?
(a) \a
(b) \b
(c) \c
(d) none of these

9.41 What does the \\ do when used in a format control string?
(a) It outputs the backslash character
(b) It delimits comments
(c) both a and b
(d) none of these

9.42 Which statement about an escape sequence is false?
a) \r moves the cursor to the beginning of the next line.
b) \b moves the cursor back one position on the current line.
c) \f moves the cursor to the start of the next logical page.
d) \v moves the cursor to the next vertical tab position.

9.11 Formatting Input with scanf

9.43 A field width ________ be included in the format control string of the scanf statement.
(a) can
(b) cannot
(c) must
(d) none of these

9.44 The ________ character reads data from the input stream and discards the data.
(a) %
(b) conversion specifier
(c) assignment suppression
(d) //

9.45 Which is not an input formatting capability of scanf?
a) inputting all types of data
b) inputting specific characters from an input stream
c) skipping specific characters in the input stream
d) replacing specific characters in the input stream

9.46 The %i scanf conversion specifier is not capable of inputting which type of data?
a) hexadecimal
b) binary
c) decimal
d) octal

9.47 Which statement about scan sets is false?
a) A scan set is a set of characters enclosed in parentheses and preceded by a percent sign in the format control string.
b) A scan set scans the characters in the input stream looking only for those characters that match the characters contained in the scan set.
c) Each time a character in the input stream matches a character in the scan set, the input stream character is stored in the scan set’s corresponding argument—a pointer to a character array.
d) The scan set stops inputting characters when a character that is not contained in the scan set is encountered.

9.12 Secure C Programming

9.48 Which of the following statements is false?
(a) In general, as you study any programming language, if the language specification says that doing something can lead to undefined behavior, avoid doing it to prevent security vulnerabilities.
(b) The C standard specifies the exact behavior for every case in which incorrect library-function argu-ments are passed to a library function.
(c) Undefined behaviors can occur when using printf with improperly formed conversion specifica-tions.
(d) None of the above.