title author
 
title author
 
etc
 
and outputs to screen 
 
title (author)
 
title (author)
 
etc

我目前遇到的问题是错误：

“ifstream infile has incomplete type and cannot be defined”

以下是该计划：

#include <iostream>              
#include <string>
#include <ifstream>
using namespace std; 
 
string bookTitle [14];
string bookAuthor [14];
int loadData (string pathname);         
void showall (int counter);
 
int main ()
 
{
int counter;  
string pathname;
 
cout<<"Input the name of the file to be accessed: ";
cin>>pathname;
loadData (pathname);
showall (counter);
}
 
 
int loadData (string pathname) // Loads data from infile into arrays
{
    ifstream infile; 
    int counter = 0;
    infile.open(pathname); //Opens file from user input in main
    if( infile.fail() )
     {
         cout << "File Failed to open";
         return 0;
     }   
 
     while (!infile.eof())
     {
           infile >> bookTitle [14];  //takes input and puts into parallel arrays
           infile >> bookAuthor [14];
           counter++;
     }
 
     infile.close;
}
 
void showall (int counter)        // shows input in title(author) format
{
     cout<<bookTitle<<"("<<bookAuthor<<")";
}