如何使用 C++ 匹配同一文件中的数据

Question

该程序以列格式打印报告，该列的格式与示例输出中显示的完全相同。

#include <iostream>
#include <string>
#include <fstream>
#include <iomanip>
using namespace std;

int main()
{
    char user_gender, user_smoker;
    string user_eyecolor;
    int user_minAge, user_maxAge, user_minHeight, user_maxHeight;

    cout << "What is the gender of your ideal match(M, F, N) ? ";
    cin >> user_gender;

    cout << "What is the minimum age? ";
    cin >> user_minAge;

    cout << "What is the maximum age? ";
    cin >> user_maxAge;

    cout << "What is the minimum height (in inches)? ";
    cin >> user_minHeight;

    cout << "What is the maximum height (in inches)? ";
    cin >> user_maxHeight;

    cout << "Smoker (Y/N)? ";
    cin >> user_smoker;

    cout << "What is the eyecolor (Blue, Green, Grey, Brown)? ";
    cin >> user_eyecolor;

    cout << endl << endl;
    //Variables to check against the conditions
    int countGender = 0;
    int partialMatch = 0;
    int fullMatch = 0;

    cout << endl << left << setw(1) << "  Name" << fixed << right << setw(22) << "Age" << fixed << right << setw(12) << "Height" << fixed << right << setw(12) << "Smoker" << fixed << right << setw(15) << "Eye Color" << fixed << right << setw(22) << "Phone" << endl;
    cout << "-----------------------------------------------------------------------------------------------------------------" << endl;


    //Now read the file data.
    ifstream fin("matches.txt");

    if (fin.is_open())
    {
        while (!fin.eof())
        {
            string firstname, lastname, eyecolor, phoneno;
            char gender, smoker;
            int age, height;
            fin >> firstname >> lastname >> gender >> age >> height >> smoker >> eyecolor >> phoneno;

            if (gender == user_gender)
            {
                countGender++;

                //Now check to see if the age and height are between the maximum and minum preferences. 
                if ((age >= user_minAge && age <= user_maxAge) && (height >= user_minHeight && height <= user_maxHeight))
                {

                    //Then check to see if the smoking preference and eye color are also a match. 
                    if (user_smoker == smoker && user_eyecolor == eyecolor)
                    {
                        fullMatch++;

                        cout << "* " << firstname << "  " << lastname  << setw(25) << age << setw(11) << height << setw(11) << smoker << setw(11) << eyecolor << setw(11) << phoneno << endl;
                    }

                    else if (eyecolor == user_eyecolor)
                    {
                        partialMatch++;

                        cout << "  " << firstname << "  " << lastname << setw(24) << age << setw(11) << height << setw(11) << smoker << setw(11) << eyecolor<< setw(11) << phoneno << endl;
                    }
                }
            }
        }
        cout << "-----------------------------------------------------------------------------" << endl;
        cout << "There were " << fullMatch << " matches and " << partialMatch << " partial matches out of " << countGender << " records." << endl;
        cout << "-----------------------------------------------------------------------------" << endl;

        fin.close();
    }
    else {
        cout << "File did not open";
    }


    return 0;
}

****该程序运行得非常好，但我没有将输出打印在上面示例输出中所示格式的列中。 **** 编写一个程序，打开文件并逐条读取记录。该程序将跳过性别偏好不匹配的任何记录。在符合性别偏好的那些记录中，检查年龄和身高是否在最大和最小偏好之间。然后检查吸烟偏好和眼睛颜色是否也匹配。如果至少 3 个剩余字段匹配，则认为记录部分匹配，并将其打印在报告中。如果所有 4 个剩余字段都匹配，则该记录是完全匹配的，并将其打印在报告中，并在其旁边带有一个星号。在程序结束时，关闭文件并报告指定性别的总记录数，部分匹配的记录数，完美匹配的记录数。

Charlie Bradbury    F   42  65  N   Green   555-867-5309
Bobby Singer        M   70  69  Y   Brown   555-867-5309
Dean Winchester     M   43  72  N   Brown   555-867-5309
Sam Winchester      M   39  75  N   Brown   555-867-5309
Bela Talbot         F   39  69  Y   Blue    555-867-5309
James Novak         M   46  71  Y   Blue    555-867-5309

Answer 1

1. 使用具有调试功能的适当 IDE（例如Visual Studio Community Edition）。

2. 在有问题的方法的第一行设置断点，例如在你的情况下第 9 行

3. 逐行遍历您的代码，看看它做了什么。

4. 将鼠标悬停在变量上或使用局部变量或观察窗口查看变量的值

5. 想想你是什么预计会看到并将其与您的内容进行比较实际看到.在 99% 的情况下，计算机比你更正确，这是对你的误解。