Determining the Type of Literal Constants

Integer constants are of type int, unless they are too large, in which case they are type long int
Floating point constants are of type double
You can change these defaults with modifiers

Literal	Type
3	int (signed int)
3L	long int
3U	unsigned int
3.0	double
3.0F	float
3.0L	long double

Integer constants are base 10 by default; 2, 63, 83
A constant starting with a 0 is octal (base 8); 02, 077, 0123
A constant starting with a 0x is hexadecimal (base 16); 0x2, 0x3f, 0x53

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