Reading numbers from a file : ifstream « File Stream « C++ Tutorial

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C++ Tutorial » File Stream » ifstream

12.9.6.Reading numbers from a file

#include <fstream>

#include <iostream>

#include <iomanip>

using std::cout;

using std::endl;





int main() {

  const char* filename = "test.txt";

  std::ifstream inFile(filename);



  // Make sure the file stream is good

  if(!inFile) {

    cout << endl << "Failed to open file " << filename;

    return 1;

  }



  long n = 0;

  while(!inFile.eof()) {

    inFile >> n;

    cout << std::setw(10) << n;

  }

  cout << endl;

  return 0;

}

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12.9.ifstream
	12.9.1.	Read and display a text file line by line.
	12.9.2.	Display a file using ifstream.get()
	12.9.3.	Use ifstream.read() and ofstream.write()
	12.9.4.	Display a file from a given starting point
	12.9.5.	Reading a text file
	12.9.6.	Reading numbers from a file
	12.9.7.	Show a file from starting offset
	12.9.8.	Ignore up to 10 characters or until first space is found
	12.9.9.	ifstream: read buffer and seek file position

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