【C++ Primer Plus习题】9.4

news2024/12/24 2:07:08

问题:

解答:
main.cpp

#include <iostream>
#include "sales.h"
using namespace std;
using namespace SALES;

int main()
{
	Sales s1, s2;
	double de[QUARTERS] = { 12.1,32.1,42.1,51.1 };
	setSales(s1, de, QUARTERS);
	showSales(s1);
	cout << endl;
	setSales(s2);
	showSales(s2);

	return 0;
}

sales.h

#pragma once
namespace SALES
{
	const int QUARTERS = 4;
	struct Sales
	{
		double sales[QUARTERS];
		double average;
		double max;
		double min;
	};

	void setSales(Sales& s,  double ar[], int n);
	void setSales(Sales& s);
	void showSales(const Sales& s);
}

sales.cpp

#include "sales.h"
#include <iostream>

using namespace std;
using namespace SALES;

void SALES::setSales(Sales& s, double ar[], int n)
{
	double sum = 0;
	if (n >= QUARTERS)
	{
		for (int i = 0; i < QUARTERS; i++)
		{
			s.sales[i] = ar[i];
		}
	}
	else
	{
		for (int i = 0; i < n; i++)
		{
			s.sales[i] = ar[i];
		}
		for (int i = n; i < QUARTERS; i++)
		{
			s.sales[i] = 0;
		}
	}
	s.max = s.min = s.average = s.sales[0];
	for (int i = 0; i < QUARTERS; i++)
	{
		sum += s.sales[i];
		if (s.max < s.sales[i])
		{
			s.max = s.sales[i];
		}
		if (s.min > s.sales[i])
		{
			s.min = s.sales[i];
		}
	}
	s.average = sum / QUARTERS;
}
void SALES::setSales(Sales& s)
{
	double ar[QUARTERS] = { 0.0 };
	int i = 0;
	do
	{
		cout << "请输入第" << i + 1 << "季度的销量:";
		cin >> ar[i];
		if (!cin)
		{
			cin.clear();
			while (cin.get() != '\n')
			{
				continue;
			}
			cout << "输入有误,请重新输入:";
			cin >> ar[i];
		}
		i++;
	} while (i<QUARTERS);

	setSales(s, ar, QUARTERS);

}
void SALES::showSales(const Sales& s)
{
	for (int i = 0; i < QUARTERS; i++)
	{
		cout << "第" << i + 1 << "季度的销售额为: " << s.sales[i] << endl;
	}
	cout << "平均为: " << s.average << endl;
	cout << "最大值为: " << s.max << endl;
	cout << "最小值为: " << s.min << endl;
}