Various language data type sizes

Short,long is used to qualify integer types, such as short int n;long int m; In such a declaration of variables, int can omit: short n; long m; both qualifiers are introduced to provide integers of different lengths. In different hardware and software environments, the length of the Int,short,long may not be the same, but can be determined to be 16 (bit) <=short<=int<=long, long>=32 (bit)

1. The signed,unsigned is used to qualify char or int. Represent signed Char/int and unsigned char/int, respectively.
2. Long can also be used to qualify a double (C99 standard), and its size is also related to implementation
3. A long long int was introduced into the C99 standard

the length of the variable (VC6 environment)

• Char 8 (BIT)
• Short 16
• int 32 is usually the same length as the specific machine
• Long 32
• Float 32
• Double 64

Range of Variables (VC6 environment)

• Signed char-128~127
• unsigned char 0~255
• Signed short-32768~32767
• unsigned short 0~0xffff
• Signed Int (-2147483647-1) ~2147483647
• unsigned int 0~0xffffffff
• Signed Long ( -2147483647L-1) ~2147483647
• unsigned long 0~0xfffffffful
• Float 1.175494351e-38f/* min Positive value */3.402823466e+38f * * Max value */
• Double 3.3621031431120935063e-4932l */min Positive value */1.189731495357231765e+ 4932L/* Max value */

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The struct defaults to a null byte when its argument defaults to 8, less than 8, or an integer multiple of 4. 8 has a much higher integer multiplier performance

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• C + + data type length issues:
  One, byte and word length
  Byte, eight bits is a byte, is a fixed concept. Word length refers to the amount of binary data that a computer can process at a time and is a non-fixed concept. For example, a 8-bit computer has a word length of 8, a byte, a 32-bit computer with a word length of 32, or 4 bytes, and, similarly, a 64-bit computer with a length of 64, or 8 bytes.
  Ii. data types in C + +
  1, character data char, the type is always a byte long, that is, 8 bits.
  2, Shaping int, short integer and long plastic shape. usually int is a word length, short is half word, long is one or 2 words (one word length in a 32-bit machine).
  3, floating point float, double dual precision, and long double, respectively, represents a single-precision floating-point number of double-precision floating point numbers and extended precision floating points. Typically, float is a word, double is two characters, and a long double is three or four characters.

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Java language

Basic type	Size	Minimum value	Maximum Value
Boolean	-----	-----	------
Char	16-bit	Unicode 0	Unicode 2^16-1
Byte	8-bit	-128	+127
Short	16-bit	-2^15	+2^15-1
Int	32-bit	-2^31	+2^31-1
Long	64-bit	-2^63	+2^63-1
Float	32-bit	IEEE754	IEEE754
Double	64-bit	IEEE754	IEEE754

Various language data type sizes