c++ - while 循环跳过所有其他输入

Question

我正在尝试编写一个程序来打开用户输入的文件名，然后获取该文件中的名称并将它们从 LastName、FirstName MiddleName 到 FirstName MiddleName LastName 排列。但是我的 while 循环跳过了输入文件中的所有其他名称。

这是我的主要内容:

using namespace std;

int main() {

    string fullName;
    string lastName;
    string first_middleName;

    size_t pos;


    string fileName;
    ifstream inData;

    cout << "Please type the file name including extension(such as .txt)." << endl;
    cout << "If your file is in a different directory please specify the path:";

    getline(cin, fileName);
    inData.open(fileName.c_str());

    if(!inData) {
        cout << "Cannot open" << fileName << "." << endl;
        return 1;
    }

    getline(inData, fullName);

    while(getline(inData, fullName)) {
        pos = fullName.find(',');
        lastName = fullName.substr(0, pos);
        first_middleName = fullName.substr(pos + 2);
        cout << first_middleName << " " << lastName << endl;
        getline(inData, fullName);
    }


    inData.close();

    return 0;
}

Answer 1

这是因为你每次循环读两行

while(getline(inData,fullName)){
    ...
    getline(inData,fullName);       
}