Data Types
Signed vs. unsigned datatypes.
Data Types  Bits  Range of Values 

Unsigned char  8  0 to 255 
Signed char  8  128 to 127 
Unsigned short  16  0 to 65535 
Signed short  16  32768 to 32767 
Unsigned int  32  0 to 4294967295 
Signed int  32  2147483648 to 2147483647 
Float  32  3.4028 10^{38} to 3.4028 10^{38} 
Double  64  1.7977 10^{308} to 1.7977 10^{308} 
 one byte is 8 bits
Example  Unsigned char (byte)
The unsigned char with 8 bits can represent integers from 0 to 255  check the Binary  to Decimal, Hexadecimal and ASCII Converter
 The unsigned char (byte) 01100100 represents the decimal number 100.
Example  Signed char (byte)
With the signed char the leading bit indicates the sign of the number. 1 is negative and 0 is positive.
 The signed char (byte) 01100100 represents the decimal number 100.
 The signed char (byte) 10011100 represents the decimal number 100.
Example  Unsigned short
 The unsigned short 00000000 01100100 represents the decimal number 100.
Example  Signed short
 The signed short 00000000 01100100 represents the decimal number 100.
 The signed short 11111111 10011100 represents the decimal number 100.
Example  Unsigned int
 The unsigned int 00000000 00000000 00000000 01100100 represents the decimal number 100.
Example  Signed int
 The signed int 00000000 00000000 00000000 01100100 represents the decimal number 100.
 The signed int 11111111 11111111 11111111 10011100 represents the decimal number 100.
Example  Float
 The Float 01000010 11001000 00000000 00000000 represents the decimal number 100.
 The Float 11000010 11001000 00000000 00000000 represents the decimal number 100.
Example  Double
 The Double 01000000 01011001 00000000 00000000 00000000 00000000 00000000 00000000 represents the decimal number 100.
 The Double 11000000 01011001 00000000 00000000 00000000 00000000 00000000 00000000 represents the decimal number 100.
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