sh% ./a.out < input_file

0 4 6 7 3
1 3 6 7 4 3 6
2 3 6 7 3 2 4 6 7 7
3 5
4 3 2 9 1

while (!cin.eof())
{
//reads in everything until the end of the file
}

#include<iostream>
 
int main()
{
 
  int input;
 
  while (!cin.eof())
  {
  //reads in everything until the end of the file
 
    while (?????)
    {
       //reads in each line
    }
 
  }

while (input != '\n')

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

int main () {
	char c, str[256];
	ifstream is;

	// Open file
	is.open("Your file");

	// Loop while extraction from file is possible
	while (is.good()) {
		// Get character from file
		c = is.get();
		cout << c;
	}

	// Close file
	is.close();

	return 0;
}

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

int main () {
	int length;
	char *buffer;
	ifstream is;

	is.open("Your file", ios::binary);

	// Get length of file
	is.seekg(0, ios::end);
	length = is.tellg();
	is.seekg(0, ios::beg);

	// Allocate memory
	buffer = new char[length];

	// Read data as a block
	is.read(buffer, length);

	// Close file
	is.close();

	// Print data
	cout << buffer << endl;

	// Free memory
	delete []buffer;

	return 0;
}

#include<iostream>
 
int main()
{
  char input[200];
 
  cin.getline(input, 200);
 
  while (cin.good())
  {
 
    //modify the character line as needed 
    //(i will need to convert from char to int value)
    //which i can use another while loop to pull the first character,
    //get the digit, get the next character, get the digit, until 
    //i find a space ... then get the next number, until I find a NULL
    //which means its at the end of the line (the getline() replaces
    //the \n with a  NULL ??
 
    cin.getline(input, 200);
  }
 
  return 0;
}

#include <iostream>
using namespace std;

int main() {
	char input[200];

	cin.getline(input, 200, '\n');
	while (!cin.eof()) {
		// Do stuff here...

		cin.getline(input, 200, '\n');
	}

	return 0;
}

#include <iostream>
using namespace std;

int main() {
	char input[200];

	while (cin.getline(input, 200, '\n')) {
		// Do stuff here...
	}

	return 0;
}

#include <iostream>
#include <sstream>
#include <string>
 
int main()
{
   std::string line;
   while ( std::getline(std::cin,line) )
   {
	  std::istringstream iss(line);
	  int value;
	  while ( iss >> value )
	  {
		 std::cout << value << ',';
	  }
	  std::cout << '\n';
   }
   return 0;
}
 
/* my output
C:\Test>testpp < file.txt
0,4,6,7,3,
1,3,6,7,4,3,6,
2,3,6,7,3,2,4,6,7,7,
3,5,
4,3,2,9,1,
*/

  char input[200];
  string tokout;
  int num;
 
 
  cin.getline(input, 200);
  cout <<input<<endl;  //prints out the whole line of numbers
  tokout = strtok(input," \n\t");  //gets the first number
  cout <<tokout<<endl;  //prints the first number
  while (tokout != NULL)     //while loop to get the rest of the numbers
    {
      tokout = strtok(NULL," \n\t");
      cout <<tokout<<endl;
    }
  cout<<endl;

#include <iostream>
 #include <cstring>
 using namespace std;
 
 int main()
 {
    char input[200], *tokout;
    int num;
 
    while ( cin.getline(input, 200) )
    {
 	  cout << input << endl;  //prints out the whole line of numbers
 	  tokout = strtok(input," \n\t");  //gets the first number
 	  while ( tokout != NULL )	 //while loop to get the rest of the numbers
 	  {
 		 cout << tokout << endl;  //prints the first number
 		 tokout = strtok(NULL," \n\t");
 	  }
 	  cout<<endl;
    }
    return 0;
 }