default, fixed and scientific float output

Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 11 Drill 9
Using std_lib_facilities.h by Bjarne Stroustrup.

[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PPP
// Chapter 11 Drill 9

#include "std_lib_facilities.h"

void print_num(double _num) {
int width = 12;
cout << setw(width) << "defaultfloat\t" << defaultfloat << _num << endl;
cout << setw(width) << "fixed\t" << fixed <<_num << endl;
cout << setw(width) << "scientific\t" << scientific << _num << endl;
}

int main()
try
{
double num = 1234567.89;

print_num(num);

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

Output:
1234567.89
defaultfloat    1.23457e+06
fixed     1234567.890000
scientific     1.234568e+06
Please enter a character to exit

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