l10_4.cpp

来自「《C++程序设计教程》电子教案及例题源码」· C++ 代码 · 共 12 行

# include <iostream.h>
# include <iomanip.h>
void main( )
{
	double value = 31.4142743;
//	cout << setiosflags(ios::fixed);
//	cout << setiosflags(ios::scientific);
	int Preprecision = cout.precision(4);
	cout << value << endl;
	cout << setprecision( Preprecision ) << value << endl;
}