Comments on: 2.3 — Variable sizes and the sizeof operator http://www.learncpp.com/cpp-tutorial/23-variable-sizes-and-the-sizeof-operator/ Thu, 28 Aug 2008 18:38:31 +0000 http://wordpress.org/?v=2.5.1 By: Mitul Golakiya http://www.learncpp.com/cpp-tutorial/23-variable-sizes-and-the-sizeof-operator/#comment-19189 Mitul Golakiya Tue, 17 Jun 2008 10:17:55 +0000 http://www.learncpp.com/?p=43#comment-19189 My int takes 2 bytes. I am working with tourbo C . My PC is 32-bit. My int takes 2 bytes.
I am working with tourbo C .
My PC is 32-bit.

]]> By: Alex http://www.learncpp.com/cpp-tutorial/23-variable-sizes-and-the-sizeof-operator/#comment-17903 Alex Fri, 30 May 2008 23:37:16 +0000 http://www.learncpp.com/?p=43#comment-17903 The size of a long double can vary from machine to machine. On most machines, it is either 8 or 12. The only way to know for sure is to use sizeof(long double) just as you have. The size of a long double can vary from machine to machine. On most machines, it is either 8 or 12. The only way to know for sure is to use sizeof(long double) just as you have.

]]> By: Greg http://www.learncpp.com/cpp-tutorial/23-variable-sizes-and-the-sizeof-operator/#comment-16577 Greg Fri, 16 May 2008 11:30:30 +0000 http://www.learncpp.com/?p=43#comment-16577 Each <pre>\\t</pre> above should actually be <pre>\t</pre>, otherwise a literal '\t' will be printed rather than the intended tab character. Each 
\\t

above should actually be 

\t

, otherwise a literal ‘\t’ will be printed rather than the intended tab character.

]]> By: Syed http://www.learncpp.com/cpp-tutorial/23-variable-sizes-and-the-sizeof-operator/#comment-16380 Syed Thu, 15 May 2008 06:38:06 +0000 http://www.learncpp.com/?p=43#comment-16380 Hi, I would like to know what is the sizeof(long double); ? In this tutorial it is mentioned 8 bytes. Where as i tried in Dev C++ compiler it is giving 12. Thanks, syed Hi, I would like to know what is the sizeof(long double); ? In this tutorial it is mentioned 8 bytes. Where as i tried in Dev C++ compiler it is giving 12.

Thanks,
syed

]]> By: earthHunter http://www.learncpp.com/cpp-tutorial/23-variable-sizes-and-the-sizeof-operator/#comment-15124 earthHunter Fri, 09 May 2008 00:04:33 +0000 http://www.learncpp.com/?p=43#comment-15124 Looks like it's just a mistake. I'd expect anything containing "\\t" or "\\n" to purposely have two backslashes so they don't become actual tabs or newlines, but the apparent "output" is there. I still think it's a mistake. Looks like it’s just a mistake. I’d expect anything containing “\\t” or “\\n” to purposely have two backslashes so they don’t become actual tabs or newlines, but the apparent “output” is there. I still think it’s a mistake.

]]> By: John http://www.learncpp.com/cpp-tutorial/23-variable-sizes-and-the-sizeof-operator/#comment-14381 John Mon, 05 May 2008 01:19:44 +0000 http://www.learncpp.com/?p=43#comment-14381 In the code above, all the "\t" characters are showing as "\\t" in my browser. This makes it show up as "\\t\\t" when you run the program instead of tabs. I don't know if this is a browser displaying that code wrong (I'm running Firefox) or if you just typed that in incorrectly. Easily fixed by deleting the extra backslash. In the code above, all the “\t” characters are showing as “\\t” in my browser. This makes it show up as “\\t\\t” when you run the program instead of tabs. I don’t know if this is a browser displaying that code wrong (I’m running Firefox) or if you just typed that in incorrectly. Easily fixed by deleting the extra backslash.

]]> By: Learn C++ - » 2.2 — Keywords and naming identifiers http://www.learncpp.com/cpp-tutorial/23-variable-sizes-and-the-sizeof-operator/#comment-12629 Learn C++ - » 2.2 — Keywords and naming identifiers Wed, 23 Apr 2008 02:26:45 +0000 http://www.learncpp.com/?p=43#comment-12629 [...] 2.3 — Variable sizes and the sizeof operator [...] [...] 2.3 — Variable sizes and the sizeof operator [...]

]]> By: Learn C++ - » 2.4 — Integers http://www.learncpp.com/cpp-tutorial/23-variable-sizes-and-the-sizeof-operator/#comment-12597 Learn C++ - » 2.4 — Integers Wed, 23 Apr 2008 01:44:23 +0000 http://www.learncpp.com/?p=43#comment-12597 [...] 2.3 — Variable sizes and the sizeof operator [...] [...] 2.3 — Variable sizes and the sizeof operator [...]

]]> By: vader347 http://www.learncpp.com/cpp-tutorial/23-variable-sizes-and-the-sizeof-operator/#comment-8714 vader347 Sat, 01 Mar 2008 02:47:28 +0000 http://www.learncpp.com/?p=43#comment-8714 my long double takes 12 bytes my long double takes 12 bytes

]]> By: Alex http://www.learncpp.com/cpp-tutorial/23-variable-sizes-and-the-sizeof-operator/#comment-6561 Alex Fri, 25 Jan 2008 00:04:32 +0000 http://www.learncpp.com/?p=43#comment-6561 Computers work by moving binary digits (bits) around. However, most computers do not work with individual bits -- rather, they move data around in chunks. This chunk size is called a "word". Typically, when we speak of the bit-ness of a machine, we speak of the size of a word. Thus, a 32-bit machine has a 32-bit word size, which means it moves information around 32-bits at a time. Typically, modern computers use one word to address memory. With a 32-bit word, this means there are about 2^32 (4 billion) unique memory addresses that can be addressed. This is why 32-bit machines can only address 4GB of memory. Computers work by moving binary digits (bits) around. However, most computers do not work with individual bits — rather, they move data around in chunks. This chunk size is called a “word”. Typically, when we speak of the bit-ness of a machine, we speak of the size of a word. Thus, a 32-bit machine has a 32-bit word size, which means it moves information around 32-bits at a time.

Typically, modern computers use one word to address memory. With a 32-bit word, this means there are about 2^32 (4 billion) unique memory addresses that can be addressed. This is why 32-bit machines can only address 4GB of memory.

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