Thread: get input from a file

Yes, I knew how

Do you know how to read in a single value from a text file in the first place?

do I need to include the #include <fstream> header.

Code:

#include <iostream>
#include <cstdlib>
#include <fstream>
using namespace std;

int main()
{
 const int COL=3;
 ifstream infile ("input.txt");
 char array[n][COL];//array always have 3 column
 
 //put value into array
            ......
            ......
 system("pause");
 return 0;
}//end main

Yes, you would need to include <fstream>

This is what I suggest:
1. Write the code to open the file, read 1 string, and close the file.
You will have to decide if you're going to use strings of 2 character + '\0', or C++ strings using <string>

2. Extend the code to read in 3 such strings.
This would be in your array.
You will have to decide if you're going to use a normal array, or #include <vector> and use such dynamic arrays.

3. Extend the code to deal with the whole file.
If you're using dynamic arrays the transition shouldnt be a problem, otherwise you'll have to start using them, or use dynamic memory allocation yourself.