在c++里 如果 想cout 一个小数，怎么规定他的小数位数呢？
eg:
num = 3.6
cout<<num;

只能得到3.6
如果想得到3.60 怎么写呢？

谢谢！！！

#include <iostream.h>
#include <iomanip.h>

int main()
{
double num = 3.6;
cout << setiosflags(ios::fixed | ios::showpoint);
cout << setprecision(2);
cout << num << endl;
}

/*
refer to any iomanip formatting document for c++ io formatting
*/

The output will be 3.6 if you use

cout << setiosflags(ios::showpoint) << setprecision (2) << num

<< endl;

And output will be 3.60 if you use

cout << setiosflags(ios::fixed) << setprecision(2) << num

<< endl;

if you use cout << setiosflags(ios::fixed||ios::showpoint)

<< setprecision(2) << num << endl; , the output will be

3.60.