C++ 编译错误

Question

#include<string>
using namespace std;

int main(){
    const int SIZE=50;
    int count=0;
    ifstream fin("phoneData.txt");
    ofstream fout("phoneList.txt");
    string firstName, lastName, phoneNumber;
    if (!fin){
        cout<<"Error opening file. program ending."<<endl;
        return 0;
    }
    while (count<SIZE && fin>>phoneNumber[count]){
        fin.ignore();
        getline (fin, firstName[count], '\n');
        fin>>lastName[count];
        count++;
    }
    return 0;

到目前为止，这是我的代码。在我的 while 循环中，getline 有问题，我不断收到这样的错误消息:

error C2784: 'std::basic_istream<_Elem,_Traits> &std::getline(std::basic_istream<_Elem,_Traits> &,std::basic_string<_Elem,_Traits,_Alloc> &,const _Elem)' : could not deduce template argument for 'std::basic_istream<_Elem,_Traits> &' from 'std::ifstream'
1>        c:\program files\microsoft visual studio 9.0\vc\include\string(475) : see declaration of 'std::getline'

请帮忙!!!我想不通!

Answer 1

getline (fin, firstName[count], '\n');

应该是:

getline(fin, firstName);

还有更多的问题。这是一种可能的清理方法，它对我无法从您的代码中分辨出来的输入数据做出一些假设:

#include <iostream>
#include <fstream>
#include <string>

int main(){
  using namespace std;
  ifstream fin("phoneData.txt");
  ofstream fout("phoneList.txt");
  if (!(fin && fout)){
    clog << "Error opening file. program ending.\n";
    return 1;
  }
  const int SIZE=50;
  string firstName, lastName, phoneNumber;
  for (int count = 0; count < SIZE; ++count) {
    getline(fin, phoneNumber, ' ');
    getline(fin, firstName, ' ');
    getline(fin, lastName);
    if (!fin) {
      break;
    }
    fout << lastName << ", " << firstName << " -- " << phoneNumber << '\n';
  }
  return 0;
}

输入样本:

123 Marcy Darcy
555-0701 Daneal S.

输出样本:

Darcy, Marcy -- 123
S., Daneal -- 555-0701