13年题。

OOP/13Exam/3.5.cpp

@@ -0,0 +1,56 @@
+#include <iostream>
+#include <string>
+using namespace std;
+class Book {
+    char *title;
+    char *author;
+    int numsold;
+
+public:
+    Book() {
+    }
+    Book(const char *str1, const char *str2, const int num) {
+        int len = strlen(str1);
+        title = new char[len + 1];
+        strcpy(title, str1);
+        len = strlen(str2);
+        author = new char[len + 1];
+        strcpy(author, str2);
+        numsold = num;
+    }
+    void setbook(const char *str1, const char *str2, const int num) {
+        int len = strlen(str1);
+        title = new char[len + 1];
+        strcpy(title, str1);
+        len = strlen(str2);
+        author = new char[len + 1];
+        strcpy(author, str2);
+        numsold = num;
+    }
+    ~Book() {
+        delete title;
+        delete author;
+    }
+    void print(ostream &output) {
+        output << "book:" << title << endl;
+        output << "author:" << author << endl;
+        output << "total:" << numsold << endl;
+    }
+};
+
+int main() {
+    Book obj1("Physics", "LiFu", 200), obj2;
+    obj1.print(cout);
+    obj2.setbook("C++ Programming", "SunJuason", 300);
+    obj2.print(cout);
+    return 0;
+}
+
+/*
+book:Physics
+author:LiFu
+total:200
+book:C++ Programming
+author:SunJuason
+total:300
+*/