c++ - 尝试从文件读取输入后代码无法正常运行

Question

我有一个这样设置的输入文件:

Hello there
1 4
Goodbye now
4.9 3

然后我尝试这样读取数据:

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

int main(){
    ifstream input("file.txt");
    string name;
    double num1, num2;

    while(!input.eof()){
        getline(input, name);
        input >> num1;
        input >> num2;

        cout << name << endl;
        cout << num1 << " " << num2 << endl;
    }
}

但是读取似乎失败了。有人可以帮我吗？

Answer 1

问题 1:getline 与 >>。这篇文章的解决方案:C++ iostream: Using cin >> var and getline(cin, var) input errors

问题2:inupt.eof() 测试循环结束，这篇文章:Why is iostream::eof inside a loop condition considered wrong?

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

int main(){
  ifstream input("dat.txt");
  string name;
  double num1, num2;

  while (getline(input, name)) {  // getline fails at the end of file
    input >> num1 >> num2;
    input.ignore();
    cout << name << endl;
    cout << num1 << " " << num2 << endl;
  }
}