C++ Infile 不完整类型错误
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/9816900/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Infile incomplete type error
提问by kd7vdb
I am building a program that takes an input file in this format:
我正在构建一个采用这种格式的输入文件的程序：
title author
title author
etc
and outputs to screen
title (author)
title (author)
etc
The Problem I am currently getting is a error:
我目前遇到的问题是一个错误：
"ifstream infile has incomplete type and cannot be defined"
“ifstream infile 类型不完整，无法定义”
Following is the program:
以下是程序：
#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<<")";
}
回答by Alok Save
File streams are defined in the header <fstream>and you are not including it.
文件流在标头中定义，<fstream>您不包括它。
You should add:
你应该添加：
#include <fstream>
回答by kd7vdb
Here is my code with the previous error fixed Now I get a problem of the program crashing after I input the name of the text file.
这是我修复了先前错误的代码 现在我在输入文本文件的名称后遇到程序崩溃的问题。
#include <iostream>
#include <string>
#include <fstream>
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
{
fstream infile;
int counter = 0;
infile.open(pathname.c_str()); //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<<")";
}
