OJ Board

Posted: **Sun Feb 27, 2005 2:48 pm**

Hi

what data type is fast ?
-bool
-char
if u know please reply me.

MAP

Posted: **Sun Feb 27, 2005 11:23 pm**

They both use up one byte.. and there isn't really a bool in pure C..

Posted: **Mon Feb 28, 2005 8:11 am**

say, if bool and char use up one byte, then what was the point of introducing bool type in ANSI C++, is it just to be in accordance with other languages that have a bool data type.

Posted: **Mon Feb 28, 2005 10:03 am**

AFAIK the latest C standard defines two things:

1. bool data type (for which you need the stdbool.h header)
2. _Bool in case you don't want the former breaking legacy code,
this one being a macro with the added advantage that it can #undef-ed.

I will need to look up the size of the former though, but most likely as with others it must be left to the implementors.

Regards,
Suman.

Posted: **Mon Feb 28, 2005 1:35 pm**

Code: Select all

joachim@joabox[bool]$ gcc -dumpversion
3.3.4
joachim@joabox[bool]$ cat testbool.c
#include <stdio.h>
#include <stdbool.h>

int main(){

   printf("%d\n",sizeof(bool));
   return 0;
   }
joachim@joabox[bool]$ gcc testbool.c
joachim@joabox[bool]$ a.out
1
joachim@joabox[bool]$

Posted: **Mon Feb 28, 2005 2:41 pm**

Hi
which data type is profitable for visit a index char of bool.

- I want to add two value with bit operation how can i do that. and also
multiplication.

- Is there any bit wise visiting operation. (that i can get very quickly)

If any body know about this thing please reply me.

thankx

MAP

Posted: **Tue Mar 01, 2005 11:51 am**

Mohiul, this post will not fulfill your requirement entirely, but I advise you to study bitset of C++ STL. There are features that might interest you.

Posted: **Mon May 16, 2005 8:23 am**

mohiul, do you want to access a variable in bit? you can use the bit wise operation, use the '&' operator

Posted: **Mon May 16, 2005 8:27 am**

mohiul, do you want to access a variable in bit? you can use the bit wise operation, use the '&' operator