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added range of values (#33656) 

* added range of values

* fix: formatted table with markdown
pull/28705/head^2
Suvarna Sivadas 2019-06-28 04:16:11 +05:30 committed by Randell Dawson
parent 6822234614
commit 18908b40c4
1 changed files with 16 additions and 1 deletions
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17
guide/english/c/data-types/index.md
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@ -17,6 +17,7 @@ Since C is not interpreted language, it is not allowed to declare variables dyna
#### Characters: `char`
`char` holds characters- things like letters, punctuation, and spaces. In a computer, characters are stored as numbers, so `char` holds integer values that represent characters. The actual translation is described by the ASCII standard. <a href='http://www.asciitable.com/' target='_blank' rel='nofollow'>Here's</a> a handy table for looking up that.
The most basic data type in C. It stores a single character and requires a single byte of memory in almost all compilers.
The actual size, like all other data types in C, depends on the hardware you're working on. By minimum, it is at least 8 bits, so you will have at least 0 to 127. Alternatively, you can use `signed char` to get at least -128 to 127.
@ -102,8 +103,22 @@ There are various functions in C which do not accept any parameter. A function w
#### 3. Pointers to void
A pointer of type void * represents the address of an object, but not its type. For example, a memory allocation function ```void *malloc( size_t size);``` returns a pointer to void which can be casted to any data type.
| Data Type | Memory (bytes) | Range | Format Specifier |
|-----------| :--------------: | :-----: | :----------------: |
| short int | 2 | -32,768 to 32,767 | %hd |
| unsigned short int | 2 | 0 to 65,535 | %hu |
| unsigned int | 4 | 0 to 4,294,967,295 | %u |
| int | 4 | -2,147,483,648 to 2,147,483,647 | %d |
| long int | 4 | -2,147,483,648 to 2,147,483,647 | %ld |
| unsigned long int | 4 | 0 to 4,294,967,295 | %lu |
| long long int | 8 | -(2^63) to (2^63)-1 | %lld |
| unsigned long long int | 8 | 0 to 18,446,744,073,709,551,615 | %llu |
| signed char | 1 | -128 to 127 | %c |
| unsigned char | 1 | 0 to 255 | %c |
| float | 4 | | %f |
| double | 8 | | %lf |
| long double | 12 | | %Lf |
# Before you go on...
## A review
* The actual abilities of C data types depend on the hardware. As a result, minimum sizes are defined for the data types.
* Floating point numbers will allow you to have decimals, while integer numbers won't.