c data types

1Type	             Size (bytes)	                     Format Specifier
2int	                at least 2, usually 4	                 %d, %i
3char	             1	                                     %c
4float	             4	                                     %f
5double	             8	                                     %lf
6short int	         2 usually	                             %hd
7unsigned int        at least 2, usually 4	                 %u
8long int	        at least 4, usually 8	                 %ld, %li
9long long int	        at least 8	                         %lld, %lli
10unsigned long int	    at least 4	                         %lu
11unsigned long long int	at least 8	                         %llu
12signed char           	1	                                 %c
13unsigned char	        1	                                 %c
14long double	      at least 10, usually 12 or 16	             %Lf

1char	1 byte	-128 to 127 or 0 to 255
2unsigned char	1 byte	0 to 255
3signed char	1 byte	-128 to 127
4int	2 or 4 bytes	-32,768 to 32,767 or -2,147,483,648 to 2,147,483,647
5unsigned int	2 or 4 bytes	0 to 65,535 or 0 to 4,294,967,295
6short	2 bytes	-32,768 to 32,767
7unsigned short	2 bytes	0 to 65,535
8long	8 bytes or (4bytes for 32 bit OS)	-9223372036854775808 to 9223372036854775807
9unsigned long	8 bytes	0 to 18446744073709551615

1#include <stdio.h>
2#include <stdbool.h>
3#include <stdlib.h>
4
5#define FailedToEducate    101
6#define Success            400
7
8int main(void) {
9	/* 
10    	A long int is:
11        	32-bit compiler: 
12            	MIN: -2,147,483,648
13            	MAX: 2,147,483,647
14                unsigned MAX: 4,294,967,295
15            64-bit compiler: 
16            	MIN: -9,223,372,036,854,775,808
17            	MAX: 9,223,372,036,854,775,807
18                unsigned MAX: 18,446,744,073,709,551,615
19        Therefore...a long int will either be
20        -2,147,483,648 and 2,147,483,647 for a 32-bit compiler
21        or -9,223,372,036,854,775,808 and 
22        9,223,372,036,854,775,807 for a 64-bit compiler, 
23        whilst a long long int will just be 
24        -9,223,372,036,854,775,808 and 
25        9,223,372,036,854,775,807
26        
27        I hope this made sense!
28    */
29  
30  	bool userUnderstands=true;
31  
32  	if(userUnderstands) {
33    	exit(Success);
34    } else {
35    	exit(FailedToEducate);
36    }
37}

1C datatypes and bytes