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This is a compiler publish, float is a single-precision, smknow next to nothing of very precise length, to the centre length of plastic, then you can use long double: long twice his range is 10 to 5000 periods side, a large ah, memorandum the emulating floating-point type, the retinue is important in studying the language

morsel unsigned binary numeral range of merits hexadecimal exegesis coverage
8-bit binary numbers 0 ~ 255 (255 = 2 ^ 8-1) 00 ~ 0FFH
16-bit binary numbers 0 ~ 65535 (65535 = 2 ^ 16-1) 0000H ~ 0FFFFH
32 bit binary number from 0 to 4294967295 (**= 2 ^ 32-1) 00000000H ~ 0FFFFFFFFH

machine code with a signed performance
1. Signed binary representation:
signed binary digit with the highest bit to indicate sign: 0 means positive, 1 negative.
digit binary number with the sign bit hexadecimal mathematical range of the scope of representation
8-bit binary number of -128 ~ +127 ; 80H ~ 7FH
16-bit binary numbers -32768 ~ +32767 ; 8000H ~ 7FFFH
32 bit binary number -2147483648 ~ +2147483647 80000000H ~ 7FFFFFFFH

2, sign bit of that: The most commonly accustomed usage that the original code, anti-code and complement.
(1) the original code notation: a machine number x by the sign bit and the effective value of two parts, set the sign bit is x0, x the true value of the absolute value | x | = x1x2x3 ... xn, then x, the machine can be expressed as the number of the original code:
[x] original =, when x> = 0 时, x0 = 0, while x

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