20、C++编程练习与实现详解

C++编程练习与实现详解

在C++编程中，有许多实用的练习和实现方法，下面将详细介绍一些常见的编程练习及其实现。

1. 姓名输入与问候程序

以下代码实现了一个简单的姓名输入与问候程序，它会根据用户输入的姓名长度给出不同的提示：

const int nm_size = 128;  
char user_name[nm_size];  
cout << "Please enter your name: ";  
cin  >> setw(nm_size) >> user_name;  

switch (strlen(user_name))  
{  
    // same case labels for 0, 1  
    case 127:  
        // maybe string was truncated by setw()  
        cout << "That is a very big name, indeed -- "  
             << "we may have needed to shorten it!\n"  
             << "In any case,\n";  

        // no break -- we fall through ...  
    default:  
        // the 127 case drops through to here -- no break  
        cout << "Hello, " <<