C++，同時從不同數據類型的文件循環

我有一個包含此信息的文件：C++，同時從不同數據類型的文件循環

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

我有一個計數控制的循環，將做正確的前3行和使用信息，但我在努力使用循環將重複使用該循環，直到文件中顯示所有信息，而不管文件上有多少個匹配的高爾夫球手。我在向正確的方向徵求指點，任何援助將不勝感激。

#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; 
}

來源

2016-12-07 squirmintoad

您的第一步是擺脫'>>'。將'std :: getline'與'>>'混合[產生意外的結果]（http://stackoverflow.com/questions/21567291/why-does-stdgetline-skip-input-after-a-formatted-extraction）。使用'std :: getline'閱讀三行文本。爲第二行和第三行構建一個「std :: istringstream」，然後使用'std :: istringstream'解析它們。 –

請閱讀前兩行，爲接下來的N個值使用for循環，並將所有內容包裝在while循環中。可能最好將N值的讀數放在一個函數中，它會更漂亮。 –

正如所述使用循環將有必要得到你想要的。此外，由於getline和提取返回假如果他們失敗，你可以使用它們進行循環測試：

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; 
}

來源

2016-12-07 03:41:28 tinstaafl

C++，同時從不同數據類型的文件循環

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