c ++ while来自具有不同数据类型的文件的循环

Question

我有一个包含此信息的文件：

Bev Powers
3
76 81 73
Chris Buroughs
5
88 90 79 81 84
Brent Mylus
2
79 81

我有一个计数控制的循环，将执行前3行并正确使用信息，但我正在努力使用循环重复循环，直到从文件显示所有信息，无论有多少高尔夫球手有匹配文件。 我正在向正确的方向寻求指示，任何协助都将受到赞赏。

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

ifstream inScores;
string filename;

string name;

int loopCount, matchScore;

int count = 1;
float mean = 0;
float adder = 0;

int main()
{
    cout << endl << "Enter the golfer's filename: ";
    getline(cin,filename);
    cout << endl;

    inScores.open(filename.c_str());
      if(!inScores)
        {
            cout << "** " << filename << " does not exist. Please ";
            cout << "check the spelling and rerun ";
            cout << "the program with an existing golfer file. ** " << endl << endl;

            return 1;
        }


    getline(inScores,name);
    inScores >> loopCount;

    cout << name << " has " << loopCount << " matches with scores of" << endl << endl;

    inScores >> matchScore;
    while (count <= loopCount)
    {
            cout << "Match " << count << ": " << matchScore << endl;
            adder = adder + matchScore;
            adder = adder + matchScore;
            inScores >> matchScore;
            count++;
    }

    cout << endl;
    int(mean) = .5 + (adder / loopCount);
    cout << "The mean score is " << mean << endl << endl;

inScores.close();
return 0;
}

Answer 1

如上所述，使用循环将是必要的，以获得你想要的。 此外，由于getline和extract如果失败则返回false，您可以在循环中使用它们进行测试：

ifstream inScores;
string filename;

string name;

int loopCount , matchScore;

int count = 1;
float mean = 0;
float adder = 0;

int main()
{
    cout << endl << "Enter the golfer's filename: ";
    getline( cin , filename );
    cout << '\n';

    inScores.open( filename );
    if ( !inScores )
    {
        cout << "** " << filename << " does not exist. Please ";
        cout << "check the spelling and rerun ";
        cout << "the program with an existing golfer file. ** " << "\n\n";

        return 1;
    }
    while ( getline( inScores , name ) )
    {
        if ( inScores >> loopCount )
        {
            cout << name << " has " << loopCount << " matches with scores of" << "\n\n";
        }
        else
        {
            cout << "File read error";
            return 1;
        }

        for ( int count = 1; count <= loopCount; count++ )
        {
            if ( inScores >> matchScore )
            {
                cout << "Match " << count << ": " << matchScore << '\n';
                adder = adder + matchScore;

            }
            else
            {
                cout << "File read error";
                return 1;
            }
        }

    }
    cout << '\n';
    int( mean ) = .5 + ( adder / loopCount );
    cout << "The mean score is " << mean << "\n\n";

    inScores.close();
    return 0;
}