Read a text file and respond

I tried to make a program that would take a txt file and respond to it. Found some tutorial and used the code from there with some modifications.
But when I run it, it just opens the dos with nothing in it.

Here's the code:

Code:

//This program should take a text file named VCC.txt and read it, put it to a string 
//and then if it matches the given string, it should respond

//Includes
 #include <fstream>
 #include <iostream>
 

 using namespace std;
 
    int main()
    {
        //The string that the text file will be read to
        char textfile[2000];
        
        //The file
        fstream file_op("Data\\VCC.txt",ios::in);
        
        //Get line and put it to char textfile
        file_op.getline(textfile,2000);
        
        //If textfile is Hello, wich it is, it should respond with saying Hello back, but somehow this doesn't work
        if(textfile == "Hello")
        {
               cout<<"Hello";
        }
              
        
        while(1){}
          
    }

Thanks

> if(textfile == "Hello")
Use strcmp() to compare char array type strings

Use the C++ string class instead of C style strings.

I agree! Then you change this line,

file_op.getline(textfile,2000);

to:

getline( file_op, StringVariable );

If there is a lot of lines in the text file you can just declare a dummy variable and loop the above line:

Code:

string Temp, FileDetails;

while ( getline( in, Temp ) )	// in is like your fstream
{
	FileDetails += Temp;	// The line of the file you are wanting.
	FileDetails += "\n";	// Appends a new line to it (getline gets a line)
}

Originally Posted by twomers

I agree! Then you change this line,

file_op.getline(textfile,2000);

to:

getline( file_op, StringVariable );

If there is a lot of lines in the text file you can just declare a dummy variable and loop the above line:

Code:

string Temp, FileDetails;

while ( getline( in, Temp ) )	// in is like your fstream
{
	FileDetails += Temp;	// The line of the file you are wanting.
	FileDetails += "\n";	// Appends a new line to it (getline gets a line)
}

Alright, I use the strcmp, and now it works, but I still have a problem with the C++ style strings.
How to use the getline()?
Could you give me an example, please?

I don't need the rest because the textfile will only have one line in it.

I feel like such a n00b right now. Maybe I am one.

Ok, if you want to use getline for cin, you use it like this:

Code:

getline( cin, StringVariable );

where StringVariable is a string type defined like so:

Code:

string StringVariable;

However, if you want to use if for File IO, I would just do what I said in my previous post, and replace the cin with b_file or whatever it was you had.