Add money_binary.cpp

money_binary.cpp

@@ -0,0 +1,47 @@
+#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';
+    }
+    void save_to_binary(const char *filename)
+    {
+        std::ofstream ofile(filename, std::ios::binary);
+        ofile.write(reinterpret_cast<char *>(&yuan), sizeof(yuan));
+        ofile.write(reinterpret_cast<char *>(&jiao), sizeof(jiao));
+        ofile.write(reinterpret_cast<char *>(&fen), sizeof(fen));
+        ofile.close();
+    }
+    void read_from_binary(const char *filename)
+    {
+        std::ifstream ifile(filename, std::ios::binary);
+        ifile.read(reinterpret_cast<char *>(&yuan), sizeof(yuan));
+        ifile.read(reinterpret_cast<char *>(&jiao), sizeof(jiao));
+        ifile.read(reinterpret_cast<char *>(&fen), sizeof(fen));
+        ifile.close();
+    }
+};
+
+int main()
+{
+    Money m{1, 2, 3}, n{};
+    m.save_to_binary("money.dat");
+    n.read_from_binary("money.dat");
+    std::cout << n;
+    return 0;
+}