1 #include <iostream.h> 2 #include <iomanip.h> 3 void main(void) 4 { 5 cout.setf(ios::fixed); 6 cout<<setprecision(2)<<(float)0.1<<endl;//输出0.10 7 cout.unsetf(ios::fixed); 8 cout<<setprecision(2)<<(float)0.1<<endl; //输出0.1 9 }