24_输出双精度数.cpp

//2007-9-29 12:48:18#include <iostream>#include <iomanip>//使用控制符必须加头文件，否则会出错！using namespace std;int main(){double a = 123.456789012345;cout<<a<<endl;cout<<setprecision(9)<<a<<endl;cout<<setprecision(6);cout<<setiosflags(ios::fixed)<<setprecision(8)<<a<<endl;cout<<setiosflags(ios::scientific)<<a<<endl;cout<<setiosflags(ios::scientific)<<setprecision(4)<<a<<endl;return 0;}/*在VC++6.0中运行的结果是：---------------------123.457123.456789123.45678901123.45679123.5Press any key to continue---------------------*/