spaces & special characters in C++

[Niels]

Whenever I enter a line with spaces in a cin >> .. line my program seems
to skip all cin lines after that point. Could someone please explain me
why this is? I'm calling this procedure from main, to enter certain data
about a product:

Product* getData()
{
// Create new item
Product* pProd = new Product;

// Read product name
cout << "\nProduct Name:";
cin >> pProd->szProductName;

// if 'exit' entered, return 0 to display results and exit program
if ((stricmp(pProd->szProductName,"exit") == 0))
{
// ... het lege object verwijderen...
delete pProd;

// ... en een nul retourneren om de invoer te beëindigen.
return 0;
}

// Read price
cout << "Product Price:";
cin >> pProd->nPrice;

cout << "Expecting Usetime in years";
cin >> pProd->nEUY;
pProd->pNext = 0;

// Return new Product
return pProd;
}
Whenever I enter a space in the product name, I seem to get the cout
lines over and over again. I'm calling this procedure from main until a
0 is returned meaning that no more entries are wanted.

[Erik Wikström]

On 2006-06-05 10:03, Niels wrote:

Whenever I enter a line with spaces in a cin >> .. line my program seems
to skip all cin lines after that point. Could someone please explain me
why this is? I'm calling this procedure from main, to enter certain data
about a product:

Product* getData()
{
// Create new item
Product* pProd = new Product;

// Read product name
cout << "\nProduct Name:";
cin >> pProd->szProductName;

// if 'exit' entered, return 0 to display results and exit program
if ((stricmp(pProd->szProductName,"exit") == 0))
{
// ... het lege object verwijderen...
delete pProd;

// ... en een nul retourneren om de invoer te beëindigen.
return 0;
}

// Read price
cout << "Product Price:";
cin >> pProd->nPrice;

cout << "Expecting Usetime in years";
cin >> pProd->nEUY;
pProd->pNext = 0;

// Return new Product
return pProd;
}
Whenever I enter a space in the product name, I seem to get the cout
lines over and over again. I'm calling this procedure from main until a
0 is returned meaning that no more entries are wanted.

By default input with cin is terminated by any whitespace (don't know if
it's possible to change this behaviour). You can use getline() to read a
whole line.

std::string prodName;
std::getline(std::cin, prodName);
std::cout << prodName;

Erik Wikström
--
"I have always wished for my computer to be as easy to use as my
telephone; my wish has come true because I can no longer figure
out how to use my telephone" -- Bjarne Stroustrup

[Niels]

Erik Wikström schreef:

On 2006-06-05 10:03, Niels wrote:

Whenever I enter a line with spaces in a cin >> .. line my program
seems to skip all cin lines after that point. Could someone please
explain me why this is? I'm calling this procedure from main, to enter
certain data about a product:

Product* getData()
{
// Create new item
Product* pProd = new Product;

// Read product name
cout << "\nProduct Name:";
cin >> pProd->szProductName;

// if 'exit' entered, return 0 to display results and exit program
if ((stricmp(pProd->szProductName,"exit") == 0))
{
// ... het lege object verwijderen...
delete pProd;

// ... en een nul retourneren om de invoer te beëindigen.
return 0;
}

// Read price
cout << "Product Price:";
cin >> pProd->nPrice;

cout << "Expecting Usetime in years";
cin >> pProd->nEUY;
pProd->pNext = 0;

// Return new Product
return pProd;
}
Whenever I enter a space in the product name, I seem to get the cout
lines over and over again. I'm calling this procedure from main until
a 0 is returned meaning that no more entries are wanted.

By default input with cin is terminated by any whitespace (don't know if
it's possible to change this behaviour). You can use getline() to read a
whole line.

std::string prodName;
std::getline(std::cin, prodName);
std::cout << prodName;

Erik Wikström

That worked great! Thank you!

Niels.

[Rolf Magnus]

Niels wrote:

Whenever I enter a line with spaces in a cin >> .. line my program seems
to skip all cin lines after that point. Could someone please explain me
why this is? I'm calling this procedure from main, to enter certain data
about a product:

Product* getData()
{
// Create new item
Product* pProd = new Product;

// Read product name
cout << "\nProduct Name:";
cin >> pProd->szProductName;
From the stricmp call below, I guess that pProd->szProductname is an array
of char? You should better use std::string. Otherwise, your program has no
way of ensuring that the user doesn't enter more characters than the array
could handle. A buffer overflow (which is the reason for most of the
security holes in computer programs) would be the result.
// if 'exit' entered, return 0 to display results and exit program
if ((stricmp(pProd->szProductName,"exit") == 0))
{
// ... het lege object verwijderen...
delete pProd;

// ... en een nul retourneren om de invoer te beëindigen.
return 0;
}

// Read price
cout << "Product Price:";
cin >> pProd->nPrice;

cout << "Expecting Usetime in years";
cin >> pProd->nEUY;
pProd->pNext = 0;

// Return new Product
return pProd;
}
Whenever I enter a space in the product name, I seem to get the cout
lines over and over again.

Well, the space is the separator. cin stops reading there. Afterwards, you
try to read the price, which i assume is some kind of numerical type. So
cin tries to read the part after the space as number. If that fails, cin
goes to fail state and won't give you any more input until you clear that
state.

[Jerry Coffin]

In article <C6****************@newsb.telia.net>, Erik-
wi******@telia.com says...

[ ... ]

By default input with cin is terminated by any whitespace (don't know if
it's possible to change this behaviour). You can use getline() to read a
whole line.

It's sort of possible to change this behavior. Input
using string extractor normally terminates with
whitespace, but the definition of "whitespace" depends on
the stream's locale. The locale has a ctype facet that
tells what is whitespace for that locale.

You could define a locale that only says '\r' and '\n'
are whitespace, and tell a stream to use that locale, and
afterwards, using a string extractor from that stream
would read characters up to a '\r' or '\n', but would
include '\t', '\v', ' ', etc.

--
Later,
Jerry.

The universe is a figment of its own imagination.

[nick]

Jerry Coffin wrote:

In article <C6****************@newsb.telia.net>, Erik-
wi******@telia.com says...

[ ... ]

By default input with cin is terminated by any whitespace (don't know if
it's possible to change this behaviour). You can use getline() to read a
whole line.

It's sort of possible to change this behavior. Input
using string extractor normally terminates with
whitespace, but the definition of "whitespace" depends on
the stream's locale. The locale has a ctype facet that
tells what is whitespace for that locale.

You could define a locale that only says '\r' and '\n'
are whitespace, and tell a stream to use that locale, and
afterwards, using a string extractor from that stream
would read characters up to a '\r' or '\n', but would
include '\t', '\v', ' ', etc.

--
Later,
Jerry.

how exactly would you do that i understand a little what your trying to
say but how would you set up the syntax. the reason im asking is that
im writing a program to take inputs add the proper tags and create an
html page from it!! i tryuseing getline() is it in the cstdlib? im
currently using iostream which has cin.getline() but the syntax is
difrent if someone could clarify this it would be nice

[sherifffruitfly]

By default input with cin is terminated by any whitespace (don't know if
it's possible to change this behaviour). You can use getline() to read a
whole line.

im
currently using iostream which has cin.getline() but the syntax is
difrent if someone could clarify this it would be nice

I'm almost completely confused by cin, cin.get() and cin.getline - if
anyone knows of a good webpage that covers them very clearly, it'd be
appreciated.

My Prata text just has little bits and pieces strewn about his book :(

[Jerry Coffin]

In article <1149954973.474742.97210
@u72g2000cwu.googlegroups.com>, Mr*********@gmail.com
says...

[ ... I had said: ]

You could define a locale that only says '\r' and '\n'
are whitespace, and tell a stream to use that locale, and
afterwards, using a string extractor from that stream
would read characters up to a '\r' or '\n', but would
include '\t', '\v', ' ', etc.

[ ... ]
how exactly would you do that i understand a little what your trying to
say but how would you set up the syntax. the reason im asking is that
im writing a program to take inputs add the proper tags and create an
html page from it!! i tryuseing getline() is it in the cstdlib? im
currently using iostream which has cin.getline() but the syntax is
difrent if someone could clarify this it would be nice

http://tinyurl.com/fgu9o

--
Later,
Jerry.

The universe is a figment of its own imagination.