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rdstate(), istrstream, int, float
From: |
Alex Vinokur |
Subject: |
rdstate(), istrstream, int, float |
Date: |
Wed, 16 May 2001 07:31:55 +0200 |
==============================
%uname -sr
Linux 2.2.17-21mdk
%g++ -v
gcc version 2.95.3 19991030 (prerelease)
==============================
Here is a program.
A question is below.
---------- C++ code : BEGIN --------------
#include <string>
#include <iostream>
#include <strstream>
//======================================
int main ()
{
string s1(" ");
istrstream tmp1(s1.c_str());
istrstream tmp2(s1.c_str());
int the_int;
float the_float;
tmp1.unsetf(ios::skipws);
tmp1 >> the_int;
cout << "int\t : rdstate() = "
<< tmp1.rdstate ()
<< ", in_avail() = "
<< tmp1.rdbuf()->in_avail()
<< endl;
tmp2.unsetf(ios::skipws);
tmp2 >> the_float;
cout << "float\t : rdstate() = "
<< tmp2.rdstate ()
<< ", in_avail() = "
<< tmp2.rdbuf()->in_avail()
<< endl;
tmp1.rdbuf()->freeze (0);
tmp2.rdbuf()->freeze (0);
return 0;
}
---------- C++ code : END ----------------
---------- Running : BEGIN ---------------
%a.out
int : rdstate() = 3, in_avail() = 0
float : rdstate() = 1, in_avail() = 0
---------- Running : END -----------------
We can see that rdsate() values are different for 'int' and 'float'
(while using noskipws).
What difference between 'int' and 'float' causes that.
==================================
Alex Vinokur
mailto:address@hidden
http://up.to/alexvn
http://visitweb.com/alexvn.math
==================================
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