Question

我试图从.txt文件中读取一行中的逗号分隔数据，然后将数据解析为2个不同的数组（名称和indScores）。从indScores []中，我获得了特定名称的总体平均值，并将其存储到我的avg_scores []中。然后在最后，返回读取的总行数。

示例输入数据如下所示：

  name1,x1,x2,x3,x4,x5
  name2,y1,y2,y3,y4,y5
  name3,z1,z2,z3,z4,z5
  name4,a1,a2,a3,a4,a5
  ....

我的数组输出此

  names[name2, name4, name6, name8,...]
  avg_scores[x_avg, x_avg + y_avg, x_avg + y_avg + z_avg,...]

我的整体行数是我期待的一半。我是在错误的位置编制索引还是我的逻辑错误？

int ReadScores(string fileName, string names[], float avg_scores[], int array_size){

float indScores[array_size];

int lineCounter = 0;
string myLine, nameSubString, scoreSubString;
float scoreConvert = 0.0;
float averageScores = 0.0;

ifstream myFileIn;
//open the file
myFileIn.open(fileName, ios::in);
    if (myFileIn.fail()){
        cout << "Error opening "<< fileName << endl;
        return 0;
    }
    int index = 0;
    //read the file with a while loop until the end of file is reached
    while (getline(myFileIn, myLine)){
            averageScores;
            getline(myFileIn, myLine);
            //firstComma will hold the integer value of the index position of the first comma found
            int firstComma = myLine.find(',');
             //this should grab the the names at the beginning of each string on each new line
            nameSubString = myLine.substr(0, firstComma);
            names[index] = nameSubString;


            int startingPos = 0;
            float commaCounter = 0;
            //find how many commas are in a string and use that to limit your loop
            for (int ind = 0; ind < myLine.length(); ind++){
                if (myLine[ind] == ',')
                    commaCounter++;
                }

            for (int ind = 0; ind < commaCounter; ind++){
                     //grab the first number and store it the scoreSubString variable
                     //this tells the myLine.substr to start after the very first comma
                    int found = myLine.find(',', firstComma) + 1;
                    scoreSubString = myLine.substr(found, myLine.find(','));
                    //change the value of firstComma to the next index location
                    firstComma = found + 1;

                    ///convert string to number
                    stringstream(scoreSubString) >> scoreConvert;
                    ///store number in float array
                    indScores[ind] = scoreConvert;
                }

            for (int ind = 0; ind < commaCounter; ind++){
                averageScores = indScores[ind] + averageScores;
                }
                float averageOverall = averageScores/commaCounter;
                //store the averageOverall into the avg_scores []
                avg_scores[index] = averageOverall;

        index++;
        lineCounter++;
        }
    myFileIn.close();
 return lineCounter;
}

Answer 1

是的，一旦我删除了第二个getline(myFilenIn, myLine)事情就开始匹配了。

我还需要在获取averageScores = 0的{{1}}循环之前重置for，并为averageScores添加起始位置found，我从一开始就不断开始。

我的新代码如下：

.find(',', found)

return lineCounter; }

从文件读取输入时，数组索引不正确

1 个答案: