重载负号运算符示范

CMakeLists.txt

@@ -3,4 +3,4 @@ project(CPP_11_HeavyLoad)
 
 set(CMAKE_CXX_STANDARD 11)
 
-add_executable(CPP_11_HeavyLoad main.cpp test.cpp test.h operatorDemo.cpp operatorDemo.h)
+add_executable(CPP_11_HeavyLoad main.cpp test.cpp test.h operatorDemo.cpp operatorDemo.h minusOperator.cpp minusOperator.h)

main.cpp

 #include <iostream>
 #include "test.h"
 #include "operatorDemo.h"
+#include "minusOperator.h"
 
 int main() {
 
 
-    test *test=new class test();  //申明类对象
+    test *test = new class test();  //申明类对象
     //使用重载函数
-    int max1=test->max(12,23);
-    int max2=test->max(22,34.567);
-    test->max("字符串",12,12);
-    cout<<max1<<","<<max2<<endl;
+    int max1 = test->max(12, 23);
+    int max2 = test->max(22, 34.567);
+    test->max("字符串", 12, 12);
+    cout << max1 << "," << max2 << endl;
 
     //重载＋号运算符
-    operatorDemo op1(12,12,12), op2(34,23,14); //申明两个类对象并给出初始值
+    operatorDemo op1(12, 12, 12), op2(34, 23, 14); //申明两个类对象并给出初始值
     op1.print();
     op2.print();
 
     //使用重载函数使两个对象相加
-    operatorDemo OP=op1+op2;  //实际上全写为： op1.operator+(op2); 只不过operator和()可以免写罢了
+    operatorDemo OP = op1 + op2;  //实际上全写为： op1.operator+(op2); 只不过operator和()可以免写罢了
     OP.print();
 
+    //使用重载函数给参数取反
+    minusOperator mo(12, 34), mo2(33, 99);
+    minusOperator a = -mo;  //相当于 mo.operator-();
+    minusOperator b = -mo2; //相当于 mo2.operator-();
+    a.print();
+    b.print();
+
 
     return 0;
 }

minusOperator.cpp

+//
+// Created by 11010 on 2023/4/8.
+//
+
+#include "minusOperator.h"
+
+minusOperator::minusOperator() {
+    //给成员赋初值
+    len = 0;
+    width = 0;
+}
+
+minusOperator::minusOperator(int l, int w) : len(l), width(w) {
+
+}
+
+//相当于给参数取相反数
+minusOperator minusOperator::operator-() {
+    len = -len;
+    width = -width;
+    return minusOperator(len,width);
+}
+
+
+void minusOperator::print() {
+  cout<<"运行结果："<<len<<","<<width<<endl;
+}

minusOperator.h

+//
+// Created by 11010 on 2023/4/8.
+//
+
+#ifndef CPP_11_HEAVYLOAD_MINUSOPERATOR_H
+#define CPP_11_HEAVYLOAD_MINUSOPERATOR_H
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+//ؼ
+class minusOperator {
+public:
+    int len;
+    int width;
+    void print();
+    minusOperator();
+    minusOperator(int l,int w);
+    minusOperator operator- (); //
+
+
+};
+
+
+#endif //CPP_11_HEAVYLOAD_MINUSOPERATOR_H