setw
Specifies the width of the display field.
T6 setw(
streamsize _Wide
);
Parameters
- _Wide
The width of the display field.
Return Value
The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.width(_Wide), then returns str.
Example
// iomanip_setw.cpp
// compile with: /EHsc
// Defines the entry point for the console application.
//
// Sample use of the following manipulators:
// resetiosflags
// setiosflags
// setbase
// setfill
// setprecision
// setw
#include <iostream>
#include <iomanip>
using namespace std;
const double d1 = 1.23456789;
const double d2 = 12.3456789;
const double d3 = 123.456789;
const double d4 = 1234.56789;
const double d5 = 12345.6789;
const long l1 = 16;
const long l2 = 256;
const long l3 = 1024;
const long l4 = 4096;
const long l5 = 65536;
int base = 10;
void DisplayDefault( )
{
cout << endl << "default display" << endl;
cout << "d1 = " << d1 << endl;
cout << "d2 = " << d2 << endl;
cout << "d3 = " << d3 << endl;
cout << "d4 = " << d4 << endl;
cout << "d5 = " << d5 << endl;
}
void DisplayWidth( int n )
{
cout << endl << "fixed width display set to " << n << ".\n";
cout << "d1 = " << setw(n) << d1 << endl;
cout << "d2 = " << setw(n) << d2 << endl;
cout << "d3 = " << setw(n) << d3 << endl;
cout << "d4 = " << setw(n) << d4 << endl;
cout << "d5 = " << setw(n) << d5 << endl;
}
void DisplayLongs( )
{
cout << setbase(10);
cout << endl << "setbase(" << base << ")" << endl;
cout << setbase(base);
cout << "l1 = " << l1 << endl;
cout << "l2 = " << l2 << endl;
cout << "l3 = " << l3 << endl;
cout << "l4 = " << l4 << endl;
cout << "l5 = " << l5 << endl;
}
int main( int argc, char* argv[] )
{
DisplayDefault( );
cout << endl << "setprecision(" << 3 << ")" << setprecision(3);
DisplayDefault( );
cout << endl << "setprecision(" << 12 << ")" << setprecision(12);
DisplayDefault( );
cout << setiosflags(ios_base::scientific);
cout << endl << "setiosflags(" << ios_base::scientific << ")";
DisplayDefault( );
cout << resetiosflags(ios_base::scientific);
cout << endl << "resetiosflags(" << ios_base::scientific << ")";
DisplayDefault( );
cout << endl << "setfill('" << 'S' << "')" << setfill('S');
DisplayWidth(15);
DisplayDefault( );
cout << endl << "setfill('" << ' ' << "')" << setfill(' ');
DisplayWidth(15);
DisplayDefault( );
cout << endl << "setprecision(" << 8 << ")" << setprecision(8);
DisplayWidth(10);
DisplayDefault( );
base = 16;
DisplayLongs( );
base = 8;
DisplayLongs( );
base = 10;
DisplayLongs( );
return 0;
}
default display d1 = 1.23457 d2 = 12.3457 d3 = 123.457 d4 = 1234.57 d5 = 12345.7 setprecision(3) default display d1 = 1.23 d2 = 12.3 d3 = 123 d4 = 1.23e+003 d5 = 1.23e+004 setprecision(12) default display d1 = 1.23456789 d2 = 12.3456789 d3 = 123.456789 d4 = 1234.56789 d5 = 12345.6789 setiosflags(4096) default display d1 = 1.234567890000e+000 d2 = 1.234567890000e+001 d3 = 1.234567890000e+002 d4 = 1.234567890000e+003 d5 = 1.234567890000e+004 resetiosflags(4096) default display d1 = 1.23456789 d2 = 12.3456789 d3 = 123.456789 d4 = 1234.56789 d5 = 12345.6789 setfill('S') fixed width display set to 15. d1 = SSSSS1.23456789 d2 = SSSSS12.3456789 d3 = SSSSS123.456789 d4 = SSSSS1234.56789 d5 = SSSSS12345.6789 default display d1 = 1.23456789 d2 = 12.3456789 d3 = 123.456789 d4 = 1234.56789 d5 = 12345.6789 setfill(' ') fixed width display set to 15. d1 = 1.23456789 d2 = 12.3456789 d3 = 123.456789 d4 = 1234.56789 d5 = 12345.6789 default display d1 = 1.23456789 d2 = 12.3456789 d3 = 123.456789 d4 = 1234.56789 d5 = 12345.6789 setprecision(8) fixed width display set to 10. d1 = 1.2345679 d2 = 12.345679 d3 = 123.45679 d4 = 1234.5679 d5 = 12345.679 default display d1 = 1.2345679 d2 = 12.345679 d3 = 123.45679 d4 = 1234.5679 d5 = 12345.679 setbase(16) l1 = 10 l2 = 100 l3 = 400 l4 = 1000 l5 = 10000 setbase(8) l1 = 20 l2 = 400 l3 = 2000 l4 = 10000 l5 = 200000 setbase(10) l1 = 16 l2 = 256 l3 = 1024 l4 = 4096 l5 = 65536
Requirements
Header: <iomanip>
Namespace: std