1 byte = 8 bits
Unsigned 8-bit value range = 2^8
1k=1024 bytes=2^10
1m=1024k
1g=1024m
| C language | 16-bit editor | 32-bit editor | 64-bit editor | |||
|---|---|---|---|---|---|---|
| type of data | Occupied bytes | Ranges | Occupied bytes | Ranges | Occupied bytes | Ranges |
| char | 1 | -128~127 | 1 | -128~127 | 1 | -128~127 |
| unsigned char | 1 | 0～256 | 1 | 0～256 | 1 | 0～256 |
| short int | 2 | -32768～32767 | 2 | -32768～32767 | 2 | -32768～32767 |
| int | 2 | -32768～32767 | 4 | -2147483648～2147483647 | 4 | -2147483648～2147483647 |
| unsigned int | 2 | 0～65536 | 4 | 0～4294967296 | 4 | 0～4294967296 |
| float | 4 | 1.4013E-45~3.4028E+38 | 4 | 1.4013E-45~3.4028E+38 | 4 | 1.4013E-45~3.4028E+38 |
| double | 8 | 4.9E-324 ~ 1.7977E + 308 | 8 | 4.9E-324 ~ 1.7977E + 308 | 8 | 4.9E-324 ~ 1.7977E + 308 |
| long | 4 | -2147483648～2147483647 | 4 | -2147483648～2147483647 | 8 | -2^63 ~ 2^63-1 |
| long long | 8 | -2^63 ~ 2^63-1 | 8 | -2^63 ~ 2^63-1 | 8 | -2^63 ~ 2^63-1 |
| unsigned long | 4 | 0 ~ 2^32 | 4 | 0 ~ 2^32 | 8 | 0~2^64 |
| java | |||
|---|---|---|---|
| type of data | Occupied bytes | Ranges | Defaults |
| boolean | 1 | true/false | false |
| byte | 1 | -128~127 | 0 |
| short | 2 | -32768~32767 | 0 |
| int | 4 | -2147483648～2147483647 | 0 |
| long | 8 | -2^63 ~ 2^63-1 | 0 |
| char | 2 | -32768~32767 | \u0000 (Unicode means space) |
| float | 4 | 1.4013E-45~3.4028E+38 | 0.0f |
| double | 8 | 4.9E-324 ~ 1.7977E + 308 | 0.0d |