C++primer plus第六版课后编程题答案9.4

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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=4n=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]!='\0';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'\0'//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");}

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