tailieunhanh - Absolute C++ (4th Edition) part 37

Absolute C++ (4th Edition) part 37. KEY BENEFIT: C++ programming concepts and techniques are presented in a straightforward style using understandable language and code. KEY TOPICS: C++ Basics; Flow of Control; Function Basics; Parameters and Overloading; Arrays; Structures and Classes; Constructors; Operator Overloading, Friends, and References; Strings; Pointers and Dynamic Arrays; Separate Compilation and Namespaces; Streams and File I/O; Recursion; Inheritance; Polymorphism and Virtual Functions; Templates; Linked Data Structures; Exception Handling; Standard Template Library; Patterns and UML. MARKET: Useful for both beginning and intermediate C++ programmers. . | Character Manipulation Tools 365 The value of cl is set to A the value of c2 is set to B and the value of c3 is set to n . The variable c3 is not set equal to C . One thing you can do with the member function get is to have your program detect the end of a line. The following loop will read a line of input and stop after passing the newline character n . Any subsequent input will be read from the beginning of the next line. For this first example we have simply echoed the input but the same technique would allow you to do whatever you want with the input. cout Enter a line of input and I will echo it n char symbol do symbol cout symbol while symbol n cout That s all for this demonstration. n This loop will read any line of input and echo it exactly including blanks. The following is a sample dialogue produced by this code Enter a line of input and I will echo it Do Be Do 1 2 34 Do Be Do 1 2 34 That s all for this demonstration. Notice that the newline character n is both read and output. Since n is output the string that begins with the word That s is on a new line. detecting the end of an input line n and n n and n sometimes seem like the same thing. In a cout statement they produce the same effect but they cannot be used interchangeably in all situations. n is a value of type char and can be stored in a variable of type char. On the other hand n is a string that happens to be made up of exactly one character. Thus n is not of type char and cannot be stored in a variable of type char. The member function put is analogous to the member function get except that it is used for output rather than input. The function put allows your program to output one character. The member function takes one argument which should be an expression of type char such as a constant or a variable of type char. The value of the argument is output to the screen when the function is called. For example the following will output the letter a to the screen a put 366