default, fixed and scientific float output

Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 11 Try This page 386
Using std_lib_facilities.h by Bjarne Stroustrup.

[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PPP
// Chapter 11 Try This page 386

#include "std_lib_facilities.h"

double a = 1234567.89;

int main()
try
{
//cout << setprecision(5) << a << endl; To set precision
cout << defaultfloat << a << ‘\t’
<< fixed << a << ‘\t’
<< scientific << a << ‘\n’;

keep_window_open();
}
catch (runtime_error e) {
cout << e.what() << endl;
keep_window_open();
}
catch (…) {
cout << "Exiting" << endl;
keep_window_open();
}
[/code]

Output:
1.23457e+06     1234567.890000  1.234568e+06
Please enter a character to exit