实验11参考答案.docx

1、实验11参考答案实验11类与对象2（2）请将自己报告部分，文字和程序代码，加粗完成下面实验内容和实验要求。 自测练习 1编程练习：简易计算器编写一个SimpleCalculator类，包含一些public方法来对两个double型变量进行加减乘除运算。实例输出： 将下面程序代码补充完整，并运行（注意：共有3个文件：SimpleCalculator.h, SimpleCalculator.cpp, CalcDriver.cpp，此3个文件放到一个工程中进行调试）/ SimpleCalculator.hclass SimpleCalculator public: /*补充 add方法的原型声明 *

2、/ double subtract ( double, double ) const; double multiply( double, double ) const; /* 补充divide方法的原型声明 */;/ SimpleCalculator.cpp#include “SimpleCalculator.h”/ 补充add方法的定义double SimpleCalculator:subtract( double a, double b ) const return a b;double SimpleCalculator:multiply( double a, double b ) con

3、st return a * b;/补充 divide方法的定义/ CalcDriver.cpp#include #include “SimpleCalculator.h”using namespace std;int main() double a=10.0; double b=20.0; / 声明SimpleCalculator类的对象sc cout “The value of a is: “aendl; cout ”The value of b is: “ b endl; /*写一条语句，声明变量addition，通过SimpleCalculator类对象sc计算a+b，并将结果赋值给ad

4、dition变量 */ cout “Adding a and b yields “ addition endl; double substraction = sc.substract ( a, b ); cout “Subtracting b from a “ subtraction endl; double multiplication = sc.multiply ( a, b ); cout “Multiplying a and b yields “ multiplication endl; /*写一条语句，声明变量division，通过SimpleCalculator类对象sc计算a/b

5、，并将结果赋值给division变量 */ cout “Dividing a by b yields “ division endl; return 0;补充后代码：/ SimpleCalculator.hclass SimpleCalculator public: /*补充 add方法的原型声明 */ double add( double, double ) const; double substract( double, double ) const; double multiply( double, double ) const; double divide( double, doubl

6、e ) const; /* 补充divide方法的原型声明 */;/ SimpleCalculator.cpp#include SimpleCalculator.hdouble SimpleCalculator:add(double a,double b)const return a + b;double SimpleCalculator:substract( double a, double b ) const return a - b;double SimpleCalculator:multiply( double a, double b ) const return a * b;doub

7、le SimpleCalculator:divide(double a,double b)const return a / b;/ CalcDriver.cpp#include #include SimpleCalculator.husing namespace std;int main() double a=10.0; double b=20.0; SimpleCalculator sc;/ 声明SimpleCalculator类的对象sc cout The value of a is: aendl; cout The value of b is: b endl; /*写一条语句，声明变量a

8、ddition，通过SimpleCalculator类对象sc计算a+b，并将结果赋值给addition变量 */ double addition = sc.add ( a, b ); cout Adding a and b yields addition endl; double substraction = sc.substract ( a, b ); cout Subtracting b from a substraction endl; double multiplication = sc.multiply ( a, b ); cout Multiplying a and b yiel

9、ds multiplication endl; /*写一条语句，声明变量division，通过SimpleCalculator类对象sc计算a/b，并将结果赋值给division变量 */ double division = sc.divide (a,b); cout Dividing a by b yields division endl; return 0;运行结果：修改上面创建的类，在SimpleCalculator类中创建一个名为answer的private型数据成员，执行某项运算后，将运算结果赋给answer。增加一个名为getAnswer的函数，其功能为检索对象的最后一次算术运算结

10、果。同时，再给SimpleCalculator类增加一个构造函数，将answer的值初始化为0.修改后代码：/ SimpleCalculator.hclass SimpleCalculator public: /*补充 add方法的原型声明 */ SimpleCalculator(); double add( double, double ) ; double substract( double, double ) ; double multiply( double, double ) ; double divide( double, double ) ; double getAnswer()

11、const; /* 补充divide方法的原型声明 */private: double answer;/ SimpleCalculator.cpp#include SimpleCalculator.hSimpleCalculator:SimpleCalculator() answer=0;double SimpleCalculator:add(double a,double b) answer = a + b; return answer;double SimpleCalculator:substract( double a, double b ) answer = a - b; return

12、 answer;double SimpleCalculator:multiply( double a, double b ) answer = a * b; return answer;double SimpleCalculator:divide(double a,double b) answer = a / b; return answer;double SimpleCalculator:getAnswer() const return answer;/ CalcDriver.cpp#include #include SimpleCalculator.husing namespace std

13、;int main() double a=10.0; double b=20.0; SimpleCalculator sc;/ 声明SimpleCalculator类的对象sc cout The value of a is: aendl; cout The value of b is: b endl; /*写一条语句，声明变量addition，通过SimpleCalculator类对象sc计算a+b，并将结果赋值给addition变量 */ sc.add ( a, b ); cout Adding a and b yields sc.getAnswer() endl; sc.substract

14、 ( a, b ); cout Subtracting b from a sc.getAnswer() endl; sc.multiply ( a, b ); cout Multiplying a and b yields sc.getAnswer() endl; /*写一条语句，声明变量division，通过SimpleCalculator类对象sc计算a/b，并将结果赋值给division变量 */ sc.divide (a,b); cout Dividing a by b yields sc.getAnswer() endl; return 0;运行结果修改程序，给SimpleCalculator类增加input函数，使用户可以自己输入两个double型变量。函数将输入的值存储在类新增private成员数据a和b中。再给SimpleCalculator类创建两个构造函数，一个没有参数，将a和b初始化为0；另一个将输入的两个double型变量作为参数，并将a和b初始化为输入的值