Reading data from .txt file

[pratras]

Hi,

I am trying to read an array values from Tmin.txt file. I take array size from user viz. number of raw & column and then, read the following data from Tmin.txt file which look like this:

20 40 20 25 30

20 30 40 20 25

20 40 20 25 30

20 30 40 20 25

30 40 40 30 40

i am using getline, and then converting it to int by using atoi. But my code is not working. can somebody help me out on this.

Code :

// reading a text file
#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main () {

 string line;
 int i,j,c;
 int Ncoil, Ntank;
 int **Tmin;
 char str[256];

 cout << "Number of coils to be cleaned: ";
 cin >> Ncoil;

 cout << "Number of tanks: ";
 cin >> Ntank;

Tmin = new int *[Ncoil];

 for (int i = 0; i <= Ncoil; ++i)
     {
		 Tmin[i] = new int[Ntank];
		 for(int j = 0; j <= Ntank; ++j)
			{
			 ifstream myfile ("Tmin.txt");
				if (myfile.is_open())
				{
					while ( myfile.good() )
						{ 
						getline(myfile, line, ' ');
						c = atoi(line);
						Tmin[i][j] = c;
						myfile.close();
						}
				}
				else cout << "Unable to open output file";
			 }
	 }
  return 0;
}

[writetonsharma]

what exactly is the problem ?

Edit: please put your code in code tags.

[pratras]

"c = atoi(line);" is creating error, i don't know why.
Also, I have created a breakpoint before that line too but "line" didn't show any value. can u please run on your compiler.

Thanks

[pratras]

sorry, i didn't know about code tags. now i changed.

[writetonsharma]

atoi takes a c_string pointer.

c = atoi(line.c_str());

[pratras]

Thanks Sharmaji,
It worked. I am just a beginner in c++.