reading second line

**hallo007** · 12-12-2006

Code:

#include <fstream>
#include <iostream>

using namespace std;

int main()
{
  char str[10];

  //Creates an instance of ofstream, and opens example.txt
  ofstream a_file ( "example.txt" );
  // Outputs to example.txt through a_file
  a_file<<"This text will now be inside of example.txt\n";
a_file<<"second line";
  // Close the file stream explicitly
  a_file.close();
  //Opens for reading the file
  ifstream b_file ( "example.txt" );
  //Reads one string from the file
  b_file>> str;
  //Should output 'this'
  cout<< str <<"\n";
  cin.get();    // wait for a keypress
  // b_file is closed implicitly here
}

now i print the word THIS and if i do it again i will show TEXT , but how do i read the second line???

**manutd** · 12-12-2006

getline().

**hallo007** · 12-12-2006

Code:

24 C:\Documents and Settings\user\Mijn documenten\teste.cpp
 no matching function for call to `getline(int)'

how do i use it??

**hallo007** · 12-12-2006

mmm
when i do cin.getline(source ,2);
i still get the second word

**hk_mp5kpdw** · 12-12-2006

Code:

#include <string>

...

string temp;

...

getline(b_file,temp);  // Read whole 1st line from file into string variable "temp"
cout << temp << endl;  // Output whole 1st line to "cout"

getline(b_file,temp);  // Read whole 2nd line from file into "temp"
cout << temp << endl;  // Output whole 2nd line to "cout"

That's the string version of the getline function. If you wanted to still use character array's to do this, you could use the stream's getline member function instead (assuming you had a large enough array to store things in you could actually read a whole line in at a time).

Code:

const int line_len = 255;
char line[line_len];  // Store a line from the file, make sure it's big enough

...

b_file.getline(line,line_len);  // Read a single line from the input file
cout << line << endl;  // Output that single line back to cout

b_file.getline(line,line_len);  // Read the 2nd line from the input file
cout << line << endl;  // Output that 2nd line back to cout

**hallo007** · 12-12-2006

error:

Code:

17 C:\Documents and Settings\user\Mijn documenten\teste.cpp no matching function for call to `getline(std::ifstream&, std::string[50])'

**hk_mp5kpdw** · 12-12-2006

The string version of the getline function takes a string object as the second argument, not an array of strings. You do not need an array of strings to do what you are asking, just one will do (for now).

**hallo007** · 12-12-2006

thnx but how do u copy files?

**manutd** · 12-12-2006

Input all the lines and then ouput them all. Or call some function implemented by other people (I can't remember any).

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