【C++ Primer Plus习题】10.4
问题:
解答:
main.cpp
#include <iostream>
#include "sales.h"
using namespace std;
using namespace SALES;int main()
{Sales s1;double de[QUARTERS] = { 12.1,32.1,42.1,51.1 };Sales s2(de, QUARTERS);s1.showSales();s2.showSales();return 0;
}sales.h
#pragma oncenamespace SALES
{const int QUARTERS = 4;class Sales{public:Sales();Sales(double ar[], int n);~Sales();void showSales()const;private:double sales[QUARTERS];double average;double max;double min;};
}sales.cpp
#include "sales.h"
#include "sales.h"
#include <iostream>using namespace std;
using namespace SALES;Sales::Sales()
{double sum = 0.0;for (int i = 0; i < QUARTERS; i++){cout << "请输入第" << i + 1 << "个季度的销售额:";cin >> this->sales[i];}this->max = this->min = this->sales[0];for (int i = 0; i < QUARTERS; i++){if (this->max < this->sales[i]){this->max = this->sales[i];}if (this->min > this->sales[i]){this->min = this->sales[i];}sum += sales[i];}this->average = sum / QUARTERS;
}
Sales::Sales(double ar[], int n)
{double sum = 0.0;if (n > QUARTERS){for (int i = 0; i < QUARTERS; i++){this->sales[i] = ar[i];}}else{for (int i = 0; i < n; i++){this->sales[i] = ar[i];}for (int i = n; i < QUARTERS; i++){this->sales[i] = 0;}}this->max = this->min = this->sales[0];for (int i = 0; i < QUARTERS; i++){if (this->max < this->sales[i]){this->max = this->sales[i];}if (this->min > this->sales[i]){this->min = this->sales[i];}sum += sales[i];}this->average = sum / QUARTERS;
}
Sales::~Sales()
{}void Sales::showSales()const
{for (int i = 0; i < QUARTERS; i++){cout << "第" << i + 1 << "个季度的收入为:"<<this->sales[i]<<endl;}cout << "最大销售额为:" << this->max << endl;cout << "最小销售额为:" << this->min << endl;cout << "平均销售额为:" << this->average << endl;
}运行结果:
考查点:
- 结构体到类的迁移
2024年9月4日15:28:22