C variables and Data

%. 2f float double type % lf % E scientific notation

Scanf ("% F", & weight );

Float a = 3.13e-2;

Data Type keyword

Int long short

Unsigned

Char

Float double Long double

_ Bool

 

8-bit per byte

Int is stored in one word according to the number of digits in the computer. A word has 16 bits, 32 bits, and 64 bits (32 bits)

 

8-16 hexadecimal output

% O % x with prefix % # O % # x

Currently, long 64-bit long32-Bit Memory 16-bit int16-bit or 32-bit (depending on the machine's natural code)

16-32768 ~ 32768 unsigned 0-65535

32-2147483647 ~ 2147483647

64-bit is too big ......

Integer Overflow to start point

Print: Unsigned int % u long % LD % d (INT long has the same length) Short % H combination % uh

Int is the most convenient data type processed by the computer. Short is converted to int.

Char grade = 'a ';

C' character (letter, number, symbol) "" string % s

Sizeof () indicates the type size in bytes. sizeof (INT) = 4% u