Parsing C + + floating-point number format display _c language

The code looks like this:

Copy Code code as follows:

#include <stdlib.h>
#include <string>
#include <windows.h>
#include <stdio.h>
#include <iostream>
#include <limits>
#include <sstream>
using namespace Std;

String Do_fraction (long double val, int decplaces=3)
{
Ostringstream out;
Char decimal_point= '. '; European usage for ', '
int Prec=numeric_limits<long double>::d Igits10; 18
Out.precision (PREC)//override default Precision
out<<val;
String str= out.str (); Remove a string from the stream
size_t N=str.find (Decimal_point);
if (N!=string::npos)//Do you have a decimal point?
&& (Str.size () > N+decplaces))//behind at least decplaces bit?
{
str[n+decplaces]= ' n '/overwrite the first extra number
}
Str.swap (String (Str.c_str ()));//Remove extra characters after nul

return str;
}