请问这个程序错在哪里啊？

[肖尧19]

#include <iostream.h>
#include <fstream>
#include <string>
using namespace std;
void main()
{
string filename;
cout<<"please input the filename"<<endl;
cin>>filename;
cout<<"now type the content of the file"<<endl;
ifstream infile("filename");
if(!infile)
{
cout<<"sorry,file not found"<<endl;
exit(-1);
}
string lineContent;
int lineNumber=1;
while(getline(infile,lineContent,'\n')
{
cout<<lineNumber<<" "<<lineContent<<endl;
lineNumber++;
}
}

[awanghero]

cout<<lineNumber<<" "<<lineContent<<endl;

你是不是想把打进的文字输入文件
infile<<lineNumber<<" "<<lineContent<<endl;

[肖尧19]

不，我想将一个文件的内容输出

[fangrk]

#include <iostream.h>
#include <fstream>
#include <string>
using namespace std;
void main()
{
string filename;
cout<<"please input the filename"<<endl;
cin>>filename;
cout<<"now type the content of the file"<<endl;
ifstream infile(filename.c_str());
if(!infile)
{
cout<<"sorry,file not found"<<endl;
exit(-1);
}
string lineContent;
int lineNumber=1;
while(getline(infile,lineContent))
{
cout<<lineNumber++
<<" "<<lineContent<<endl;
}
}

[sea_lover]

你是不是想将一个文件的内容输出到另一个文件里啊？？
如果是：
#include <fstream.h>
#include <stdlib.h>
void main()
{
ifstream=inFile("in.txt")
ofstream=outFile("out.txt")
if!inFile || !outFile
{
cerr << "can't not open the file!" <<endl;
exit(1)
}
inFile >> filename;
outFile << filename;

}

[肖尧19]

fangrk(加把油，伙计！) 还是有错把，我用的ＶＣ６，你编译没有错误吗

[Yssss1980]

修改如下：

#include <iostream> //必须改成不带.h的头文件。（全部为STL）
#include <fstream>
#include <string>
using namespace std;
void main()
{
string filename;
cout<<"please input the filename"<<endl;
cin>>filename;
cout<<"now type the content of the file"<<endl;
ifstream infile(filename.c_str()); //不能是"filename"或filename,必须将其转换到字符串
if(!infile)
{
cout<<"sorry,file not found"<<endl;
exit(-1);
}
string lineContent;
int lineNumber=1;
while(getline(infile,lineContent,'\n'))
{
cout<<lineNumber<<" "<<lineContent<<endl;
lineNumber++;
}
}

[Yssss1980]

修改如下：

#include <iostream> //必须改成不带.h的头文件。（全部为STL）
#include <fstream>
#include <string>
using namespace std;
void main()
{
string filename;
cout<<"please input the filename"<<endl;
cin>>filename;
cout<<"now type the content of the file"<<endl;
ifstream infile(filename.c_str()); //不能是"filename"或filename
//必须将其转换到字符串
if(!infile)
{
cout<<"sorry,file not found"<<endl;
exit(-1);
}
string lineContent;
int lineNumber=1;
while(getline(infile,lineContent,'\n'))
{
cout<<lineNumber<<" "<<lineContent<<endl;
lineNumber++;
}
}

[muche]

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
void main()
{
string filename;
cout<<"please input the filename"<<endl;
cin>>filename;
cout<<"now type the content of the file"<<endl;
ifstream infile(filename.c_str());
if(!infile)
{
cout<<"sorry,file not found"<<endl;
exit(-1);
}
string lineContent;
int lineNumber=1;
while(getline(infile,lineContent))
{
cout<<lineNumber++
<<" "<<lineContent<<endl;
}
}