Chapter 9

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Chapter 9

Strings

This activity contains 10 questions.

What will the following code fragment output?

char s[20] = "hello\0 world";
cout << s << endl;

hello worldhellohA number indicating the address of the variable s in memory.

What is the output of the following snippet of code?


char s[20];
s[0]= 'h';
s[1]= 'i';

cout << s << endl;

The address of the array "s" in memory.hihhi <followed by an indeterminate amount of garbage>

What is the error regarding the following C-String?


char s[2] = "hi";

The contents of the string should be initialized as:


char s[2] = {'h','i','\0'};

There is no error.There is not enough space allocated in the array to hold all three characters ('h','i', and the null).The contents of the string cannot be set when the variable is declared, e.g. the code should read:

s[0]='h';
s[1]='i';
s[2]='\0';

Which of the following snippets of code will continually loop until the user enters the text "yes"?

char s[10];

do 
{
	cin >> s;
	cout << s << endl;
} while (!strcmp(s,"yes"));


char s[10];

do 
{
	cin >> s;
	cout << s << endl;
} while (s != "yes");

char s[10];

do 
{
	cin >> s;
	cout << s << endl;
} while (!(s == "yes");

char s[10];

do 
{
	cin >> s;
	cout << s << endl;
} while (strcmp(s,"yes"));

Which of the following will copy the text "pizza" into a C-String variable?

char s[6];
strcpy(s,"pizza");

char s[6];
s = "pizza";

char s[5];
strcpy(s,"pizza");

char s[5];
s = "pizza";

Given the following code:


char name[100], hometown[100], state[100];

cin >> name;
cin >> hometown;
cin >> state;

cout << name << endl;
cout << hometown << endl;
cout << state << endl;

What will it output if the input entered by the user is:


   Lynn Guini
   Pastaville
   Alaska

Lynn Guini
Pastaville
AlaskaLynn
Guini
PastavilleL
y
nLynn
Pastaville
Alaska

Which of the following snippets of code will continually loop until the user enters the text "yes"?

string s;

do 
{
	cin >> s;
	cout << s << endl;
} while (strcmp(s,"yes"));

string s;

do 
{
	cin >> s;
	cout << s << endl;
} while (!strcmp(s,"yes"));

string s;

do 
{
	cin >> s;
	cout << s << endl;
} while (s != "yes");

string s;

do 
{
	cin >> s;
	cout << s << endl;
} while (s == "yes");

Given the following code:


string name, hometown, state;

getline(cin,name);
getline(cin,hometown);
getline(cin,state);

cout << name << endl;
cout << hometown << endl;
cout << state << endl;

What will it output if the input entered by the user is:


   Lynn Guini
   Pastaville
   Alaska

Lynn
Pastaville
AlaskaLynn Guini
Pastaville
AlaskaL
y
nLynn
Guini
Pastaville

Which of the following will copy the text "pizza" into a string object variable?

string s[6];
s = "pizza";

string s;
strcpy(s,"pizza");

string s;
s = "pizza";

string s[6];
strcpy(s,"pizza");

In the following code:


 int num;
 string s;

 cin >> num;
 cin.ignore();
 getline(cin, s);

When run with the input of:


  10
  hello there

This program will store 10 into num and "hello there" into s. Why is the statement cin.ignore() needed?

This statement is optional and is not necessary.This statement will skip any remaining newlines in the input. The line cin >> num stops when it encounters the newline, but if it is not ignored then it will be read as the next string by getline.This statement will initialize the string variable so that input from the keyboard buffer can be copied into the storage space for the string.This statement is needed to convert from string input to an integer for storage into num.

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Chapter 9

What will the following code fragment output?
char s[20] = "hello\0 world"; cout << s << endl;

What is the output of the following snippet of code?
char s[20]; s[0]= 'h'; s[1]= 'i'; cout << s << endl;

What is the error regarding the following C-String?
char s[2] = "hi";

Which of the following snippets of code will continually loop until the user enters the text "yes"?

Which of the following will copy the text "pizza" into a C-String variable?

Which of the following snippets of code will continually loop until the user enters the text "yes"?

Which of the following will copy the text "pizza" into a string object variable?

In the following code:
int num; string s; cin >> num; cin.ignore(); getline(cin, s);
When run with the input of:
10 hello there
This program will store 10 into num and "hello there" into s. Why is the statement cin.ignore() needed?

Chapter 9

What will the following code fragment output? char s[20] = "hello\0 world"; cout << s << endl;

What is the output of the following snippet of code? char s[20]; s[0]= 'h'; s[1]= 'i'; cout << s << endl;

What is the error regarding the following C-String? char s[2] = "hi";

Which of the following snippets of code will continually loop until the user enters the text "yes"?

Which of the following will copy the text "pizza" into a C-String variable?

Which of the following snippets of code will continually loop until the user enters the text "yes"?

Which of the following will copy the text "pizza" into a string object variable?

In the following code: int num; string s; cin >> num; cin.ignore(); getline(cin, s); When run with the input of: 10 hello there This program will store 10 into num and "hello there" into s. Why is the statement cin.ignore() needed?

What will the following code fragment output?
char s[20] = "hello\0 world"; cout << s << endl;

What is the output of the following snippet of code?
char s[20]; s[0]= 'h'; s[1]= 'i'; cout << s << endl;

What is the error regarding the following C-String?
char s[2] = "hi";

In the following code:
int num; string s; cin >> num; cin.ignore(); getline(cin, s);
When run with the input of:
10 hello there
This program will store 10 into num and "hello there" into s. Why is the statement cin.ignore() needed?