setw
Gibt die Breite des Anzeigefelds für das nächste Element im Stream an.
T6 setw(
streamsize _Wide
);
Parameter
- _Wide
Die Breite des Anzeigefelds.
Rückgabewert
Der Manipulator gibt ein Objekt zurück, das beim Extrahieren aus oder Einfügen in den Stream str Folgendes aufruft: str.width(_Wide). Daraufhin wird str zurückgegeben.
Hinweise
Mit setw wird die Breite nur für das nächste Element im Stream festgelegt. Der Manipulator muss vor jedem Element eingefügt werden, dessen Breite festgelegt werden soll.
Beispiel
// 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;
}
Anforderungen
Header: <iomanip>
Namespace: std