Newline in istream

[darkknight914]

I have the following code and was wondering if there's a function that can be used in istream that will give a newline in output. For instance, having a newline between feet and inches in istream.

#include <iostream>
using namespace std;
 
class Distance {
   private:
      int feet;             // 0 to infinite
      int inches;           // 0 to 12
      
   public:
      // required constructors
      Distance() {
         feet = 0;
         inches = 0;
      }
      Distance(int f, int i) {
         feet = f;
         inches = i;
      }
      friend ostream &operator<<( ostream &output, const Distance &D ) { 
         output << "F : " << D.feet << " I : " << D.inches;
         return output;            
      }

      friend istream &operator>>( istream  &input, Distance &D ) { 
         input >> D.feet >> D.inches;
         return input;            
      }
};

int main() {
   Distance D1(11, 10), D2(5, 11), D3;

   cout << "Enter the value of object : " << endl;
   cin >> D3;
   cout << "First Distance : " << D1 << endl;
   cout << "Second Distance :" << D2 << endl;
   cout << "Third Distance :" << D3 << endl;

   return 0;
}

[ne555]

> used in istream that will give a newline in output.
don't quite understand your question
istream is used for input
as you are reading numbers, whitespace will be ignored

[Duthomhas]

Yes.

#include <iostream>
#include <limits> 

std::cin.ignore( std::numeric_limits <std::streamsize> ::max(), '\n' );

I personally like to wrap it up into a manipulator.

#include <iomanip>
#include <iostream>
#include <limits> 

template <class CharT, class Traits>
std::basic_istream <CharT, Traits> & endl( std::basic_istream <CharT, Traits> & ins )
{
  return ins.ignore( std::numeric_limits <std::streamsize> ::max(), '\n' );
}

  int n;
  {
    std::cout << "n? ";
    std::cin >> n >> endl;
  }

Enjoy!

[darkknight914]

I'll try to explain better. The code above has the following output:

Enter the value of object :
70
10
First Distance : F : 11 I : 10
Second Distance :F : 5 I : 11
Third Distance :F : 70 I : 10

I want to know if there is some type of function for spacing to use in istream(not main function, I know how to do it in main function) to make my output look like this:

Enter the value of object :
70
10
                      //this is what I'm trying to do

First Distance : F : 11 I : 10
Second Distance :F : 5 I : 11
Third Distance :F : 70 I : 10

[darkknight914]

Is there an easier way of doing it?

[Duthomhas]

As ne555 already pointed out, input and output are not the same thing.

If you want spaces, print some newlines. That’s maybe 15 or 20 characters worth of typing...