SimpleCalculator(for lab)

标签（空格分隔）： 程序设计实验 c++

本人学院

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Description:

Write a SimpleCalculator class that has public methods for adding, subtracting, multiplying and dividing two
doubles. SimpleCalculator has a private data member called answer. After performing
an operation, assign the result to answer. And a member function named getAnswer that will retrieve the result of
the last arithmetic operation performed by the object. Also, add a constructor for class SimpleCalculator
that initializes the value of answer to 0.

Note: You may expect the divisor of the divide function will not equal 0.

Test.cpp

// Lab Exercise 1: CalcTest.cpp#include <iostream>using std::cout;using std::cin;using std::endl;#include "SimpleCalculator.h"int main() {    double a;    double b;    cin >> a >> b;    SimpleCalculator sc;  // instantiate SimpleCalculator    cout << "The value of a is: " << a << "\n";    cout << "The value of b is: " << b << "\n\n";    sc.add(a, b);    cout << "Adding a and b yields " << sc.getAnswer() << "\n";    sc.subtract(a, b);    cout << "Subtracting b from a yields " << sc.getAnswer() << "\n";    sc.multiply(a, b);    cout << "Multiplying a by b yields " << sc.getAnswer() << "\n";    sc.divide(a, b);    cout << "Dividing a by b yields " << sc.getAnswer() << endl;}

SimpleCalculator.h

// Lab Exercise 1: SimpleCalculator.h// class SimpleCalculator definitionclass SimpleCalculator {    public:        SimpleCalculator();        void add(double, double);        void subtract(double, double);        void multiply(double, double);        void divide(double, double);        double getAnswer() const;    private:        double answer;};  // end class SimpleCalculator

读题

my answer

#include<iostream>#include"SimpleCalculator.h"using namespace std;SimpleCalculator::SimpleCalculator() {    answer = 0;}void SimpleCalculator::add(double a, double b) {    answer = a + b;}void SimpleCalculator::subtract(double a, double b) {    answer = a - b;}void SimpleCalculator::multiply(double a, double b) {    answer = a * b;}void SimpleCalculator::divide(double a, double b) {    answer = a / b;}double SimpleCalculator::getAnswer() const {    return answer;}

the standard answer

// Lab Exercise 1: SimpleCalculator.cpp#include "SimpleCalculator.h"// default constructorSimpleCalculator::SimpleCalculator() {    answer = 0;}  // end class SimpleClassculator constructor// function add definitionvoid SimpleCalculator::add(double a, double b) {    answer = a + b;}  // end function add// function subtract definitionvoid SimpleCalculator::subtract(double a, double b) {    answer = a - b;}  // end function subtract// function multiply definitionvoid SimpleCalculator::multiply(double a, double b) {    answer = a * b;}  // end function multiply// function divide definitionvoid SimpleCalculator::divide(double a, double b) {    answer = a / b;}  // end function divide// return answerdouble SimpleCalculator::getAnswer() const {    return answer;}  // end function getAnswer