Add money.cpp

money.cpp

@@ -0,0 +1,41 @@
+#include <iostream>
+#include <fstream>
+#include <string>
+
+class Money
+{
+private:
+    int yuan, jiao, fen;
+
+public:
+    Money(int _yuan = 0, int _jiao = 0, int _fen = 0)
+        : yuan{_yuan}, jiao{_jiao}, fen{_fen}
+    {
+    }
+    friend std::ostream &operator<<(std::ostream &os, const Money &m)
+    {
+        if (&os == &std::cout)
+            return os << m.yuan << "元" << m.jiao << "角" << m.fen << "分\n";
+        else
+            return os << m.yuan << ' ' << m.jiao << ' ' << m.fen << '\n';
+    }
+    friend std::istream &operator>>(std::istream &is, Money &m)
+    {
+        if (&is == &std::cin)
+            std::cout << "请输入元角分的数值，以空格分开：";
+        return is >> m.yuan >> m.jiao >> m.fen;
+    }
+};
+
+int main()
+{
+    std::ofstream ofile{"money.txt"};
+    Money m{}, n{};
+    std::cin >> m; // 从键盘输入m
+    ofile << m;    // m写入文件
+    ofile.close();
+    std::ifstream ifile{"money.txt"};
+    ifile >> n;     // 从文件读入n
+    std::cout << n; // 输出n
+    return 0;
+}