c++ - 棒球击球平均程序

我需要有关学校课程的帮助。我们必须编写一个程序，要求用户提供有关棒球运动员的信息。我们需要计算球员的平均击球次数，比赛次数，击球次数和击球次数。我遇到了一个问题，我的平均值计算正在输出一个设定值，而不执行任何计算。我正在为用于计算的所有变量输入整数。所以我将输入数字，例如1、4、10等。当程序显示该值时，我的公式将自身设置为15903.876。我用于平均值公式的所有变量均声明为整数，而打击平均值本身声明为double。我已经进行了一些自我调试，发现将蝙蝠击球次数除以击球次数会弄乱计算。如果有人可以帮助我解决问题，我将不胜感激。

//libaries
#include <iostream>
#include <string>
#include <sstream>
#include <iomanip>
using namespace std;

class battingAverage
{
public:

  string pName;
  int nBats;
  int tHits;
  int gPlayed;
  int gcalled;
  double average;
  double average1;
  double playeraverage;

};

int main()
{
   string numberPlayers;
  int nplayers;
 //enters the number of players the user wants to enter data for
 cout << "Enter the number of players you want to enter data for: ";
 cin >> numberPlayers;
 cout << endl;

//converts the value of numberPlayers to nplayers
istringstream convert(numberPlayers);

//sets integer nplayers equal to the value of the string numberPlayers
if(! (istringstream(numberPlayers) >> nplayers) )
{
    nplayers = 0;
}

cout << "This program calculates the batting average of baseball players.\nYou may enter data for " << nplayers << " players." << endl;

battingAverage ba[nplayers];

int index = 0;

//while statement to get data
while(index < nplayers)
{
  cout << "Enter the players last name: " << endl;
  cin >> ba[index].pName;

  cout << "Enter the number of games the player played: " << endl;
  cin >> ba[index].gPlayed;
  cout << ba[index].gPlayed << endl;

  cout << "Enter the number of games the player was called in for: " << endl;
  cin >> ba[index].gcalled;
  cout << ba[index].gcalled << endl;

  cout << "Enter the number of times the player was at bat: " << endl;
  cin >> ba[index].nBats;
  cout << ba[index].nBats << endl;

  cout << "Enter the number of time the player hit: " << endl;
  cin >> ba[index].tHits;
  cout << ba[index].tHits << endl;

  if(ba[index].tHits > ba[index].nBats)
  {
    cout << "Enter a valid value for the number of times the player hit: ";
    cin >> ba[index].tHits;
  }

  cout << endl;
  index++;

}

//rounds average to 3 decimal places
cout << fixed << setprecision( 3 );
//average formula
ba[index].playeraverage = (ba[index].nBats / ba[index].tHits) * (ba[index].gPlayed / ba[index].gcalled);//error
cout << ba[index].playeraverage << endl << endl;//just temp line to check calculation of average.

ba[index].average = .000;
ba[index].average1 = .099;

 while(ba[index].average < 1 && ba[index].average1 < .899)
{
    ba[index].average +=.100;
    ba[index].average1 += .1;
    //prints chart
    cout << setprecision( 1 ) << ba[index].average  << "00" << setprecision( 3 ) << setw(12) << ba[index].average1 << endl;
    }

cout << "1.000" << setw(12) << "1.000" << endl;

//version of system pause
cout << "\nPress enter to continue...";
cin.sync();
cin.ignore();
return 0;

}

最佳答案

您的索引值在计算过程中是错误的。

我将代码放入调试器并逐步进行调试后，立即发现了这一点，您确实应该自己做。

您从int index = 0;开始，并随着用户输入每个玩家的数据而递增。
在输入循环的末尾，索引现在与播放器的数量相同。
（例如，如果您有5位玩家，则索引现在为5，并且玩家数据存储在ba[0]，ba[1]，ba[2]，ba[3]和ba[4]中）

请注意，此时ba[5]是无效数据。但这正是ba[index]的所在！

您对ba[index]进行了所有计算，这是无效数据，您想知道为什么会得到毫无意义的结果吗？

我建议您在开始计算之前将索引设置回0，并进行另一个循环，为每个玩家0 ... 4进行必要的计算。

关于c++ - 棒球击球平均程序，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/19734136/