第七章1-3题

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第一题

#include<iostream>
double avg(double x , double y);
int main()
{
  using namespace std;
  int x = 0;
  int y = 0;
  while(1)
  {
    cout<<"请输入第一个数:";
    cin>>x;
    if(!cin)
     break;
    cout<<"请输入第二个数:";
    cin>>y;
    if(!cin)
     break;   //首先确保输入的是double
    if(x ==0 or y ==0)
     break;   //然后确保输入的2个数都不为0
    cout<<"调和平均数:"<<avg(x,y)<<endl;
   }
  cout<<"程序结束";
 return 0;
}
double avg(double x , double y)
{
  return (2*x*y)/(x+y);
}

第二题

#include<iostream>
int fillArray(double golf[] , int limit);
void showArray(const double golf[] , int limit);
void avgArray(const double golf[] , int limit);
const int MAX = 10;
using namespace std;
int main()
{
  int SIZE = 0;
  double golf[MAX];
  SIZE = fillArray(golf,MAX);
  showArray(golf,SIZE);
  avgArray(golf,SIZE);
 return 0;
}
int fillArray(double golf[] , int limit)
{
  double achievement = 0;
  int size = 0;
  golf[0] = 0;  //先把数组的第一个数填充位0，如果手动输入的时候第一个数字输入非法可以避免段错误
  for(int i = 0 ; i < limit ; ++i) 
  {
    cout<<"请输入第"<<i+1<<"个成绩";
    cin>>achievement;
    if(!cin)
    {
     cout<<"输入结束\n";
     break;
    }
    if(achievement < 0 or achievement > 100)  //不会高尔夫，假设高尔夫的成绩位0-100直接的double..
    {
     cout<<"输入结束\n";
     break;
    }
   golf[i] = achievement;
   ++size;
   }
 return size;
}
void showArray(const double golf[] , int limit)
{
  if(limit == 0)
   cout<<"无效的成绩.\n";
  for(int i = 0 ; i < limit ; ++i)
   cout<<"第"<<i+1<<"个高尔夫成绩为"<<golf[i]<<endl;
}
void avgArray(const double golf[] , int limit)
{
  double sue = 0;
  for(int i = 0 ; i < limit ; ++i)
    sue = sue + golf[i];
  if(limit != 0)
   sue = sue/limit;
  cout<<"高尔夫的平均成绩为"<<sue;
}

第三题

#include<iostream>
using namespace std;
struct box
{
  char maker[40];
  float height;
  float width;
  float lenght;
  float volume;
};
void showBox(box myBox);
void countVolume(box* myBox);
int main()
{
  box boxes = {"Volume",10.1,20.2,30.3,0};
  cout<<"立方体数据:\n";
  showBox(boxes);
  countVolume(&boxes);
  cout<<"立方体数据已经更改:\n";
  showBox(boxes);
 return 0;
}
void showBox(box myBox)
{
  cout<<"名称:"<<myBox.maker<<endl;
  cout<<"高度:"<<myBox.height<<endl;
  cout<<"宽度:"<<myBox.width<<endl;
  cout<<"长度:"<<myBox.lenght<<endl;
  cout<<"体积:"<<myBox.volume<<endl;
}
void countVolume(box* myBox)
{
  myBox->volume = (myBox->height) * (myBox->width) * (myBox->lenght);
}

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