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Starting out with C++: From Control Structures through Objects

Tony Gaddis

Chapter 10

Characters, C-Strings, and More about the string Class - all with Video Answers

Educators

Chapter Questions

Problem 1

What header file must you include in a program using character-testing functions such as isalpha and isdigit?

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Problem 2

What header file must you include in a program using the character conversion functions toupper and tolower?

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Problem 3

Assume c is a char variable. What value does c hold after each of the following state-
ments executes?

$$
\begin{array}{lll} \text { Statement} & \text { Contents of c } \\
\text { c = toupper('a'); } & \_\_\_\_\_\_ \\
\text { c = toupper('B'); } & \_\_\_\_\_\_ \\
\text { c = tolower('D'); } & \_\_\_\_\_\_ \\
\text { c = toupper('e'); } & \_\_\_\_\_\_
\end{array}
$$

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Problem 4

Look at the following code. What value will be stored in s after the code executes?
char name[10];
int s;
strcpy(name, "Jimmy");
s = strlen(name);

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Problem 5

What header file must you include in a program using string functions such as strlen and strcpy?

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Problem 6

What header file must you include in a program using string/numeric conversion functions such as atoi and atof?

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Problem 7

What header file must you include in a program using string class objects?

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Problem 8

How do you compare string class objects?

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Problem 9

The _________ function returns true if the character argument is uppercase.

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Problem 10

The _________ function returns true if the character argument is a letter of the alphabet.

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Problem 11

The _________ function returns true if the character argument is a digit.

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Problem 12

The _________ function returns true if the character argument is a whitespace character.

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Problem 13

The _________ function returns the uppercase equivalent of its character argument.

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Problem 14

The _________ function returns the lowercase equivalent of its character argument.

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Problem 15

The _________ file must be included in a program that uses character-testing functions.

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Problem 16

The _________ function returns the length of a string.

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Problem 17

To _________ two strings means to append one string to the other.

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Problem 18

The _________ function concatenates two strings.

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Problem 19

The _________ function copies one string to another.

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Problem 20

The _________ function searches for a string inside of another one.

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Problem 21

The _________ function compares two strings.

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Problem 22

The _________ function copies, at most, n number of characters from one string to another.

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Problem 23

The _________ function returns the value of a string converted to an integer.

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Problem 24

The _________ function returns the value of a string converted to a long integer.

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Problem 25

The _________ function returns the value of a string converted to a float.

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Problem 26

The _________ function converts an integer to a string.

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Problem 27

The following if statement determines whether choice is equal to 'Y' or 'y':
if (choice == 'Y' || choice == 'y')
Simplify this statement by using either the toupper or tolower function.

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03:31

Problem 28

Assume input is a char array holding a C-string. Write code that counts the number of elements in the array that contain an alphabetic character.

SS
Sarvesh Somasundaram
Numerade Educator

Problem 29

Look at the following array definition:
char str[10];
Assume name is also a char array, and it holds a C-string. Write code that copies the contents of name to str if the C-string in name is not too big to fit in str.

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Problem 30

Look at the following statements:
char str[] = "237.89";
double value;
Write a statement that converts the string in str to a double and stores the result in value.

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Problem 31

Write a function that accepts a pointer to a C-string as its argument. The function should count the number of times the character ‘w’ occurs in the argument and return that number.

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Problem 32

Assume str1 and str2 are string class objects. Write code that displays “They are the same!” if the two objects contain the same string.

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Problem 33

True or False
T F Character-testing functions, such as isupper, accept strings as arguments and test each character in the string.

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Problem 34

True or False
T F If toupper’s argument is already uppercase, it is returned as is, with no changes.

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Problem 35

True or False
T F If tolower’s argument is already lowercase, it will be inadvertently converted to uppercase.

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Problem 36

True or False
T F The strlen function returns the size of the array containing a string.

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Problem 37

True or False
T F If the starting address of a C-string is passed into a pointer parameter, it can be assumed that all the characters, from that address up to the byte that holds the null terminator, are part of the string.

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Problem 38

True or False
T F C-string-handling functions accept as arguments pointers to strings (array names or pointer variables), or literal strings.

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Problem 39

True or False
T F The strcat function checks to make sure the first string is large enough to hold both strings before performing the concatenation.

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Problem 40

True or False
T F The strcpy function will overwrite the contents of its first string argument.

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Problem 41

True or False
T F The strcpy function performs no bounds checking on the first argument.

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Problem 42

True or False
T F There is no difference between “847” and 847.

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02:09

Problem 43

Each of the following programs or program segments has errors. Find as many as you can.

char str[] = "Stop";
if (isupper(str) == "STOP")
exit(0);

James Kiss
James Kiss
Numerade Educator
02:09

Problem 44

Each of the following programs or program segments has errors. Find as many as you can.

char numeric[5];
int x = 123;
numeric = atoi(x);

James Kiss
James Kiss
Numerade Educator

Problem 45

Each of the following programs or program segments has errors. Find as many as you can.

char string1[] = "Billy";
char string2[] = " Bob Jones";
strcat(string1, string2);

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02:09

Problem 46

Each of the following programs or program segments has errors. Find as many as you can.

char x = 'a', y = 'a';
if (strcmp(x, y) == 0)
exit(0);

James Kiss
James Kiss
Numerade Educator