C/C++ data types – when we were young

 

http://www.cplusplus.com/doc/tutorial/variables/

char
Character or small integer.
1byte
signed: -128 to 127
unsigned: 0 to 255

short int(short)
Short Integer.
2bytes
signed: -32768 to 32767
unsigned: 0 to 65535

int
Integer.
4bytes
signed: -2147483648 to 2147483647
unsigned: 0 to 4294967295

long int (long)
Long integer.
4bytes
signed: -2147483648 to 2147483647
unsigned: 0 to 4294967295

bool
Boolean value. It can take one of two values: true or false.
1byte
true or false

float
Floating point number.
4bytes
+/- 3.4e +/- 38 (~7 digits)

double
Double precision floating point number.
8bytes
+/- 1.7e +/- 308 (~15 digits)

long double
Long double precision floating point number.
8bytes
+/- 1.7e +/- 308 (~15 digits)

wchar_t
Wide character.
2 or 4 bytes
1 wide character

 

* The values of the columns Size and Range depend on the system the program is compiled for. The values shown above are those found on most 32-bit systems. But for other systems, the general specification is that int has the natural size suggested by the system architecture (one "word") and the four integer types char, short, int and long must each one be at least as large as the one preceding it, with char being always one byte in size. The same applies to the floating point types float, double and long double, where each one must provide at least as much precision as the preceding one.