Why do Floats and Doubles seem the same?

[Duncan]

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.

#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]

Try this one:

#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]

I see, so it's cout's fault after all. Thanks!