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Exam 9: Strings

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Question 21

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Write a short C++ code fragment that reads a line of text and echo the line with all uppercase letters replaced by asterisks.

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#include <iostream>
#include <c...

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Question 22

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To read a character at a time,or to write a character at a time,declare a character variable ch and write this: cin >> ch;

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B) False

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Question 23

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To get a complete line of 70 or so character into a C-string is as simple as declaring a long enough C-string and then using the >> operator to extract the line from the input.

You are writing bulletproof input.Describe a simple situation in this setting where you need to know what character has been entered by the user of your program before you remove it from the input stream.Just describe the setting,do not attempt to write code for this.

Write code to define a C-string aString variable,of size 10 but do not initialize it.Use a library C-string library function to copy the C-string literal,"Hello" into aString.

The = sign used to give a variable an initial value in a definition, char ch = 'A'; is different from the = sign in an assignment. ch = 'B';

A C-string variable with a something in it is always filled with characters.

The preprocessor symbol NULL and the C-string terminator,the null character share the value 0

It is legal to assign C-string variables.

It is illegal to write char message[] ="Go Home!";

Does this code have a problem? char strVar[] = "Hello"; strcat(strVar," And Good-bye."); cout << strVar << endl;

On most systems,you don't get a chance to enter the letter when the code given below is run.Write two different code fragments that repair the problem. cout << "Enter a number:\n"; int number; cin >> number; cout << "Enter a letter;\n"; char symbol; cin.get(symbol); cout << number << " " << symbol << endl; Dialog: (Computer output is bolded. ) Enter a number: 21 Now enter a letter: 21 On my system,like many systems,one doesn't get a chance to type the letter.

ANSI/ISO C++ standard includes a string-handling library in the form of the class string.

Write an if-else statement using a C-string function that reports whether two C-strings variables contain the same C-string.

Given the following definition and initialization.Write a code fragment including a loop that will overwrite the string greeting,with 'X' in all character position,keeping the length the same.

A C-string variable is an array,so it can be indexed to access individual character positions (indexed variables of type character).

If you want to examine an input value without actually removing it from the input stream,you can apply a member function of cin to the variable ch,which you are to assume is a char type variable.Which of these does this task?