getline()跳过c中CSV文件中的前两个字符++

我的代码应该从CSV文件中读取数学问题,然后检查它们的答案是否正确,但每当我使用 getline() 它只是没有从每行中获取前两个字符。 (也忽略那些来自我必须使用的基本文件的注释)

我的代码:

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <climits>
#include <vector>
#include <string>
using namespace std;
int main(){
    fstream fin;
    int comma;
    float cans, sans, question, correct;
    fin.open("problems.csv");
    if (fin.fail()) {
        cerr << "File cannot be opened for reading." << endl;
        exit(1); // exit if failed to open the file
    }
    vector<string> row;        // new string variable
    string line, word, temp, problem; 
    correct = 0;
    question = 0;
    while(fin >> temp) { 
        question ++;
        row.clear();
        // this loop reads the file line-by-line
        // extracting 5 values on each iteration
        getline(fin, line);
        comma = line.find(",");
        cans = stod(line.substr(comma + 1));
        cout << "(" << question << ") " << line.substr(0,comma) << "? ";
        cin >> sans;
        if (sans == cans){
            cout << "true" << endl;
            correct ++;
        } else {
            cout << "false" << endl;
        }
        fin.ignore(INT_MAX, '\n'); //skips to the end of line, 
                            //ignorring the remaining columns 
    
        // for example, to print the date and East basin storage:
        //cout << date << " " << eastSt << endl;
    }
}

csv文件:

代码输出:

我试着使用 temp 而不是 line ,但后来我转换为 int s不起作用。