LCTHW: DATA TYPE
char: character data type
sizeof gives the size in units of chars. These "C bytes" need not be 8-bit bytes (though commonly they are); Any encoding of 8 bits or less (e.g. ASCII) can be used to store characters. Integer operations can be performed portably only for the range 0 ~ 127. All bits contribute to the value of the char, i.e. there are no "holes" or "padding" bits
User Defined Types typedef
typedef has syntax similar to a storage class like static, register or extern.
long double
unsigned cannot be specified.
User Defined Types union
Said to be an aggregate type.
Primitive Types added to ISO C (C99) intmax_t
Can store integers in the range -(1 << n-1)+1 ~ (1 << n-1)-1, with 'n' the width of intmax_t. Used by the "j" length modifier in the C Programming/File IO#Formatted output functions: the printf family of functions.
long: alternative name: long int, signed long, signed long int
Can store integers in the range -2147483647 ~ 2147483647 portably
short: alternate name: short int, signed short, signed short int
Can store integers in the range -32767 ~ 32767 portably. Used to reduce memory usage (although the resulting executable may be larger and probably slower as compared to using int.
Primitive Types added to ISO C (C99) long long alternative name: long long int, signed long long, signed long long int
Can store integers in the range -9223372036854775807 ~ 9223372036854775807 portably
Primitive Types added to ISO C (C99) uintmax_t
Can store integers in the range 0 ~ (1 << n)-1, with 'n' the width of uintmax_t.
Primitive Types added to ISO C (C99) unsigned long long alternative name: unsigned long long int
Can store integers in the range 0 ~ 18446744073709551615 portably.
unsigned long alternative name: unsigned long int
Can store integers in the range 0 ~ 4294967295 portably.
unsigned int: alternative name: unsigned
Can store integers in the range 0 ~ 65535 portably.
unsigned short: alternate name: unsigned short int
Can store integers in the range 0 ~ 65535 portably. Used to reduce memory usage (although the resulting executable may be larger and probably slower as compared to using int.
unsigned char
Characters stored like for type char. Can store integers in the range 0 ~ 255 portably.
signed char
Characters stored like for type char. Can store integers in the range -127 ~ 127 portably
User Defined Types enum
Enumerations are a separate type from ints, though they are mutually convertible.
int: alternative name: signed, signed int
Represents the "normal" size of data the processor deals with (the word-size); this is the integral data-type used normally. Can store integers in the range -32767 ~ 32767 portably
double
Represents the "normal" size of data the processor deals with; this is the floating-point data-type used normally. The floating-point format used is implementation defined and need not be the IEEE double-precision format. unsigned cannot be specified.
User Defined Types struct
Said to be an aggregate type.
float
Used to reduce memory usage when the values used do not vary widely. The floating-point format used is implementation defined and need not be the IEEE single-precision format. unsigned cannot be specified.
