question about skipws manipulator

[thomas]

// ws manipulator example
#include <iostream>
#include <sstream>
using namespace std;

int main () {
char a[10], b[10], c[10];

istringstream iss (" one \n \t two");
iss >noskipws;
iss >a >skipws >b >c;
cout << a << "," << b <<"."<<c<< endl;

return 0;
}
----------------------------
I expected the above code will output " ,one.two",
but it is ",."
I think a=" "; -noskipws
b="one"; --skipws
c="two"; --skipws

Anything I missed?

[Victor Bazarov]

thomas wrote:

// ws manipulator example
#include <iostream>
#include <sstream>
using namespace std;

int main () {
char a[10], b[10], c[10];

istringstream iss (" one \n \t two");
iss >noskipws;
iss >a >skipws >b >c;
cout << a << "," << b <<"."<<c<< endl;

return 0;
}
----------------------------
I expected the above code will output " ,one.two",
but it is ",."
I think a=" "; -noskipws
b="one"; --skipws
c="two"; --skipws

Anything I missed?

You didn't initialise your arrays. You didn't check the failbit after
the input operation. Try this:
===========================
// ws manipulator example
#include <iostream>
#include <sstream>
using namespace std;

int main () {
char a[10] = {}, b[10] = {}, c[10] = {};

istringstream iss (" one \n \t two");
iss >noskipws;
if (iss >a) {
if (iss >skipws >b) {
if (iss >c)
cout << "everything was converted OK\n";
else
cerr << "error reading 'c'\n";
}
else
cerr << "error reading 'b'\n";
}
else
cerr << "error reading 'a'\n";

cout << a << "," << b <<"."<<c<< endl;

return 0;
}
===========================
I get "error reading 'a'", and am guessing you need to read more about
'noskipws' and its effects on the input operations...

V
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