C++primer plus第六版课后编程题答案9.4

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我是靠谱客的博主安详眼睛，最近开发中收集的这篇文章主要介绍C++primer plus第六版课后编程题答案9.4，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

SALES.h

#ifndef SALES_H_
namespace SALES
{
const int QUARTERS=4;
struct Sales{
double sales[QUARTERS];
double average;
double max;
double min;
};
void setSales(Sales &s,const double ar[],int n);
void setSales(Sales &s);
void showSales(const Sales &s);
}
#endif

SALES.cpp

#include "SALES.h"
#include <iostream>
static int count=0;//用于记录数组有多少个元素
using
std::cout;
using std::cin;
using std::endl;
namespace SALES
{
void setSales(Sales &s,const double ar[],int n)
{
count=n;
double Avg,Max,Min,Sum=0;
if(n>4)	//如果N>4,令N=4
n=4;
if(n==0)
{
s.average=0;
s.max=0;
s.min=0;
}
if(n<=4&&n>0)
{
count=n;
Avg=Max=Min=ar[0];
for(int i=0;i<n;i++)
{
s.sales[i]=ar[i];
Sum+=s.sales[i];
if(s.sales[i]>Max)
Max=s.sales[i];
if(s.sales[i]<Min)
Min=s.sales[i];
}
Avg=Sum*1.0/n;
s.average=Avg;
s.max=Max;
s.min=Min;
}
}
void setSales(Sales &s)
{
double Max,Min,Avg;
Max=-999;	//必须适当初始化
Min=9999;
Avg=0;
double Sum=0;
for(int i=0;i<QUARTERS;i++)
{
cout<<"Please enter the valus:"<<endl;
cin>>s.sales[i];
Sum+=s.sales[i];
if(s.sales[i]>Max)
Max=s.sales[i];
if(s.sales[i]<Min)
Min=s.sales[i];
}
Avg=Sum*1.0/QUARTERS;
s.average=Avg;
s.max=Max;
s.min=Min;
count=QUARTERS;	//令count=4
}
void showSales(const Sales &s)
{
cout<<"show Sales："<<endl;
cout<<"s.sales address="<<s.sales<<endl;
//cout<<sizeof(s.sales)<<endl;
//cout<<sizeof(double)<<endl;
//int count=0;//检测数组元素个数
//for(int i=0;s.sales[i]!='';i++)	//不要试图用这个来检测数组元素个数，你可以调试一下就能发现
//{//Tips:数组空元素地址内原有的数值不一定为''
//cout<<s.sales[i]<<endl;
//count++;
//}
cout<<"count="<<count<<endl;
for(int i=0;i<count;i++)
cout<<s.sales[i]<<"
";
cout<<"nmax is :"<<s.max<<endl;
cout<<"Min is :"<<s.min<<endl;
cout<<"Avg is "<<s.average<<endl;
cout<<"show end;"<<endl<<endl;
}
}

main94.cpp

#include <iostream>
#include "SALES.h"
using namespace std;
//using namespace SALES;
void main94()
{
using SALES::Sales;
Sales s1;
Sales s2;
double arr[7]={5.2,6.3,4.1,2.5,3.0,4.2,7.5};
using SALES::setSales;
setSales(s1,arr,6);
showSales(s1);
setSales(s2);
showSales(s2);
system("pause");
}