| |
4. Constants
|
| |
| Constants are literal/fixed values assigned to variables or used directly in expressions. |
| Datatype |
example |
meaning |
| integer |
int x = 3; |
integer |
| long x = 3L; |
long integer |
| unsigned long x = 3UL |
unsigned long |
| Floting-point |
double x = 3.14; |
|
| float x = 3.14F; |
float |
| double x = 3.14L; |
long double |
| octal or hexadecimal |
int x = 0x1A |
hexadecimal |
| int x = 0x37 |
Octal |
| character |
‘\xb’ |
ASCII vertical tab |
| ‘\x7’ |
ASCII bell character |
| string |
“hello, world” |
string |
| “hello, “ “world” |
same as “hello, world” because string constants can be concatenated at compile time. |
| enumeration |
enum BOOL {NO, YES} |
NO = 0, YES = 1 |
| enum COLOR {R=1, G, B, Y=10} |
G = 2, B = 3 |
|
| |
 The complete set of escape sequence is |
 |
| |
| |
|
|
|