4.4.1.1 if-statements

wzxfirst

于 2011-01-05 22:10:00 发布

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本文介绍了一个简单的货币转换程序，该程序能够将日元、欧元和英镑转换为美元，并使用了固定汇率进行转换。用户可以输入金额及对应的货币类型，程序会输出相应的美元金额。

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TRY THIS

Use the example above as a model for a program that converts yen, euros, and pounds into dollars. If you like realism, you can find conversion rates on the web.

#include "std_lib_facilities.h" int main() { const double dol_per_yen = 0.0123; const double dol_per_euro = 1.3295; const double dol_per_pound = 1.5425; double amount = 1; char unit = 0; cout << "Please enter an amount followed by a unit(y, e or p):/n"; while(cin >> amount >> unit) { if (unit == 'y') cout << amount << "yen(s) == " << amount*dol_per_yen << "dollar(s)/n"; else if (unit == 'e') cout << amount << "euro(s) == " << amount*dol_per_euro << "dollar(s)/n"; else if (unit == 'p') cout << amount << "pound(s) == " << amount*dol_per_pound << "dollar(s)/n"; else cout << "Sorry, I don't know a unit called '" << unit << "'/n"; } }

输入1e为错误的流状态，也就是cin >> amount返回0，直接跳出while