Java basic data type range because it is binary storage 1 bytes is 8 bits first is the sign bit 0 is a non-negative 1 negative negative value is the inverse code +1 anti-code: (1 Change 0 0 to 1 sign bit unchanged)
The complement is designed to:
⑴ allows the symbolic potential energy to participate in the operation with the valid Values section, simplifying the operation rules.
⑵ the subtraction operation into addition, further simplifying the circuit design of the computing device in the computer
BYTE 1 byte 8-bit maximum 0 1111 111 = 1+2+4+8+16 +32+64---> 127 min 1 0000 000 = Inverse Code (1 1111 111) (This One is-127) +1=1 0000 000 (because the sign bit is also counted as a value) =-128
Others do not need more explanation:
Short
- The short data type is a 16-bit, signed integer with a binary complement representation
- The minimum value is -32768 ( -2^15);
- The maximum value is 32767 (2^15-1);
- The short data type can also save space as Byte. A short variable is one-second of the space occupied by the int variable;
- The default value is 0;
- Example: Short s = 1000,short r =-20000.
Int:
- The int data type is a 32-bit, signed integer with a binary complement representation;
- The minimum value is -2,147,483,648 ( -2^31);
- The maximum value is 2,147,483,647 (2^31-1);
- The generic integer variable defaults to the int type;
- The default value is 0;
- Example: int a = 100000, int b =-200000.
Long
- The Long data type is a 64-bit, signed integer with a binary complement representation;
- The minimum value is -9,223,372,036,854,775,808 ( -2^63);
- The maximum value is 9,223,372,036,854,775,807 (2^63-1);
- This type is mainly used on systems that need to compare large integers;
- The default value is 0L;
- Example: Long a = 100000l,long B = -200000l.
"L" is theoretically not case-sensitive, but if written "L" is easily confused with the number "1", it is not easy to distinguish. So it's best to capitalize.
Float
- The float data type is a single-precision, 32-bit, IEEE 754 compliant floating-point number;
- Float saves memory space when storing large floating-point groups;
- The default value is 0.0f;
- Floating-point numbers cannot be used to denote precise values, such as currency;
- Example: float f1 = 234.5f.
Double
- The double data type is a dual-precision, 64-bit, IEEE 754-compliant floating-point number;
- The default type of floating-point number is double type;
- A double type cannot also represent an exact value, such as a currency;
- The default value is 0.0d;
- Example: Double D1 = 123.4.
Boolean
- The Boolean data type represents one bit of information;
- Only two values: true and false;
- This type is only used as a sign to record the true/false situation;
- The default value is false;
- Example: Boolean one = True.
Char
- The char type is a single 16-bit Unicode character;
- The minimum value is \u0000 (that is, 0);
- The maximum value is \uffff (that is, 65,535);
- Char data type can store any character;
- Example: char letter = ' A ';.
Java Basic Data Type range
