about setting precision

[hunkeelin]

// setprecision example
#include <iostream>
#include <iomanip>
using namespace std;

int main () {
  double f =3.14159;
  cout << setprecision (5) << f << endl;
  cout << setprecision (9) << f << endl;
  cout << fixed;
  cout << setprecision (5) << f << endl;
  cout << setprecision (9) << f << endl;
  return 0;
}

i copy this code from the tutorial from the forum thee question is what if i only want 1 digit to the right of the decimal point? im' not telling u to make setprecision (2) i want to make it for any number.

[Zhuge]

That's not how setprecision() works. Precision is the number of digits you know; those before and after the decimal point.

[m4ster r0shi]

If you read that part of the tutorial more carefully, you'll find the answer to your question.

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

int main()
{
    cout << fixed << setprecision(1);

    cout << .123 << endl;
    cout << 1.23 << endl;
    cout << 12.3 << endl;
    cout << 123. << endl;

    cin.get();

    return 0;
}