Only number not alphabet. how? c++

Hello,

how to do simple code for:

if(alphabet)
output ERROR

because char is int I cannot do like this:
if(sale >= 'a' && sale =< 'z')

because if my sale is 98 it will output error because b is 98.

I want number, not character.
how?

Thank you.

re: Only number not alphabet. how? c++

kundasang@gmail.com wrote:See the family of 'std::is...' functions from <cctypeheader.
Something like

if (std::islower(sale) && std::isalpha(sale)) ...

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

re: Only number not alphabet. how? c++

On 3ÔÂ18ÈÕ, ÏÂÎç10ʱ55·Ö, kundas...@gmail.com wrote:// Enable RTTI and you can use typeid operator to get the type info.
// compile with: /GR /EHsc
#include <iostream>
#include <typeinfo.h>
using namespace std;

int main() {

char a;
int b;
cout << typeid( a ).name() << endl;
cout << typeid( b ).name() << endl;
}

re: Only number not alphabet. how? c++

kundasang@gmail.com wrote in news:a6a5021d-b4da-49a8-8016-8b63e90c9e32
@i29g2000prf.googlegroups.com:
Why not?
The if clause above does not output any error :-S
Sorry, can't really understand what you want. The char and int types are
both holding numbers in C++ and can be converted easily into each other (if
values fit). It depends on the program if it interprets the values as
numbers or as ASCII character codes. The iostream facility generally
interprets chars as ASCII character codes and ints as numbers, if this is
your concern you should convert the numbers from one type to another.

Post more code if this did not help!

regards
Paavo

re: Only number not alphabet. how? c++

On Mar 18, 8:41 pm, Paavo Helde <nob...@ebi.eewrote:Because lower case characters are not guaranteed to be
contiguous. (Nor are they with EBCDIC.)
If the question is how to determine if a particular value is
alphabetic or not, there's always:
#include <locale>

if ( std::isalpha( character, std::locale() ) )
or,
#include <cctype >

if ( std::isalpha( static_cast< unsigned char >( character ) ) )
(The first should work for any value in a char
variable---if the type containing the value is not a char, you
need to cast it to one first. The second will work for any
value in the range [0...UCHAR_MAX], or EOF---if the value is in
a char value, you must cast it to unsigned_char first, to ensure
that no negative values occur.)

--
James Kanze (GABI Software) email:james.kanze@gmail.com
Conseils en informatique orient�e objet/
Beratung in objektorientierter Datenverarbeitung
9 place S�mard, 78210 St.-Cyr-l'�cole, France, +33 (0)1 30 23 00 34