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Variables defined inside a pair of curly braces are local variables/which exist only while executing the part of the program within the braces When the implementation reaches the }, it destroys the variables, and returns any memory that they occupied to the system Defining a variable as const promises that the variable's value, will not change during its lifetime Such a variable must be initialized as part of its definition, because there is no way to do so later Input: Executing std::cin >> v discards any whitespace characters in the standard input stream, then reads from the standard input into variable v It returns std::cin, which has type istream, in order to allow chained input operations
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1-0 Compile, execute, and test the programs in this chapter 1-1 Are the following definitions valid Why or why not
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const std::string hello = "Hello"; const std::string message = hello + ", world" + "!";
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1-2 Are the following definitions valid Why or why not
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const std::string exclam = "!"; const std::string message = "Hello" + ", world" + exclam;
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1-3 Is the following program valid If so, what does it do If not, why not
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#include <iostream> #include <string> int main() { { const std::string s = "a string"; std::cout << s << std::endl; } { const std::string s = "another string"; std::cout << s << std::endl; } return 0; }
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1-4 What about this one What if we change }} to };} in the third line from the end
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#include <iostream> #include <string> int main() { { const std::string std::cout << s << { const std::string std::cout << s << return 0; }
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s = "a string"; std::endl; s = "another string"; std::endl; }}
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1-5 Is this program valid If so, what does it do If not, say why not, and rewrite it to be valid
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#include <iostream>
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This document is created with the unregistered version of CHM2PDF Pilot #include <string> int main() { { std::string s = { std::string x = std::cout << s << std::cout << x << } return 0; }
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"a string"; s + ", really"; std::endl; } std::endl;
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1-6 What does the following program do if, when it asks you for input, you type two names (for example, Samuel Beckett) Predict the behavior before running the program, then try it
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#include <iostream> #include <string> int main() { std::cout << "What is your name "; std::string name; std::cin >> name; std::cout << "Hello, " << name << std::endl << "And what is yours "; std::cin >> name; std::cout << "Hello, " << name << "; nice to meet you too!" << std::endl; return 0; }
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In 12/11, we developed a program that writes a formatted frame around a greeting In this chapter, we're going to make the program more flexible so that we can change the size of the frame without rewriting the program Along the way, we'll start learning about arithmetic in C++, and how C++ supports loops and conditions, and we'll explore the related idea of loop invariants
21 The problem
The program in 12/12 wrote a greeting with a frame around it For example, if our user gave us the name Estragon, our program would write
******************** * * * Hello, Estragon! * * * ********************
The program built up the output a line at a time It defined variables named first and second to contain the first and second lines of the output, and wrote the greeting itself, surrounded by some characters, as the third line We didn't need separate variables for the fourth or fifth output lines, because those were the same as the second and first lines respectively This approach has a major shortcoming: Each line of the output has a part of the program-and a variable-that corresponds to it Therefore, even a simple change to the output format, such as removing the spaces between the greeting and the frame, would require rewriting the program We would like to produce a more flexible form of output without having to store each line in a local variable We will approach this problem by generating each character of the output separately, except for the greeting itself, which we already have available as a string What we shall discover is that there is no need to store the output characters in variables, because once we have written a character, we don't need it any more