Why do Floats and Doubles seem the same?

Duncan (58)
I read that doubles should hold about 15 digits, and floats can only hold 7 (http://cplusplus.com/doc/tutorial/variables/). But then why does this code output as if both variables are floats? Not sure if this is cout's fault or what... I put a long double in too just to see what would happen.

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#include <iostream>
using namespace std;

int main()
{
  float pi = 3.14159265358979;
  double superpi = 3.14159265358979;
  long double supersuperpi = 3.14159265358979;

  cout << pi << endl;
  cout << superpi << endl;
  cout << supersuperpi << endl;

  return 0;
}


Output:
3.14159
3.14159
3.14159


Moschops (7244)
Try this one:


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

int main()
{
  float pi = 3.14159265358979;
  double superpi = 3.14159265358979;
  long double supersuperpi = 3.14159265358979;
  cout << setprecision (20);
  cout << pi << endl;
  cout << superpi << endl;
  cout << supersuperpi << endl;

  return 0;
}

Duncan (58)
I see, so it's cout's fault after all. Thanks!
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