function
std::showbase
<ios>
ios_base& showbase ( ios_base& str );
Show numerical base prefixes
Sets the
showbase format flag for the
str stream.
When the
showbase format flag is set, numerical values are prefixed with their C++ base format prefix when insterted into the stream. These prefixes are,
0x for hexadecimal values,
0 for octal values and no prefix for decimal-base values.
This option can be unset with the
noshowbase manipulator, inserting all numerical values without base format prefixes.
The
showbase 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
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// modify showbase flag
#include <iostream>
using namespace std;
int main () {
int n;
n=20;
cout << hex << showbase << n << endl;
cout << hex << noshowbase << n << endl;
return 0;
}
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The execution of this example displays something similar to:
See also
- noshowbase
- Do not show numerical base prefixes (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)