function
std::showpoint
<ios>
ios_base& showpoint ( ios_base& str );
Show decimal point
Sets the
showpoint format flag for the
str stream.
When the
showpoint format flag is set, the decimal point is always written for floating point values insterted into the stream, even for whole numbers. Following the decimal point, as many digits as necessary are written to match the
precision internal setting for the stream (if any).
This flag can be unset with the
noshowpoint manipulator. When the
showpoint format flag is not set, the decimal point is only written for non-whole numbers.
The precision setting can be modified using the
precision() member function of the stream.
The
showpoint flag is
not set in standard streams on initialization.
Parameters
- str
- Stream object where to apply.
Because this function is a manipulator, it is designed to be used alone with no arguments in conjunction with the insertion (<<) and extraction (>>) operations on streams (see example below).
Return Value
A reference to the stream object.
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14
|
// modify showpoint flag
#include <iostream>
using namespace std;
int main () {
double a, b, pi;
a=30.0;
b=10000.0;
pi=3.1416;
cout.precision (5);
cout << showpoint << a << '\t' << b << '\t' << pi << endl;
cout << noshowpoint << a << '\t' << b << '\t' << pi << endl;
return 0;
}
|
The execution of this example displays something similar to:
30.000 10000. 3.1416
30 10000 3.1416 |
See also
- noshowpoint
- Do not show decimal point (function)
- ios_base::flags
- Get/set format flags (public member function)
- ios_base::setf
- Set specific format flags (public member function)
- ios_base::unsetf
- Clear specific format flags (public member function)