1234 'x' 9.89 "String"Constants are used to assign a value to a variable. E.G
	int i;		/* declare a variable called 'i'	*/
	i=1234;		/* assign the constant value 1234 to 
			 * the variable 'i'			*/
        i++;		/* Change the value of the variable.	*/
1234 (decimal) 0xff (Hexidecimal) 0100 (Octal) '\xf' (Hex character)Examples of their use are:
	int i=255;	/* i assigned the decimal value of 255	*/
	i-=0xff		/* subtract 255 from i			*/
	i+=010		/* Add Octal 10 (decimal 8)		*/
			/* Print 15 - there are easier ways...	*/
	printf ("%i \n", '\xf'); 
Integer constants are assumed to have a datatype of 
 int, if it will not fit into an 'int'
the compiler will assume the constant is a 
long. You may also force the 
compiler to use 'long' by putting an 'L' on the end of the 
integer constant.
        1234L           /* Long int constant (4 bytes)          */
The other modifier is 'U' for Unsigned.
        1234U           /* Unsigned int                         */
and to complete the picture you can specify 'UL'
        1234UL          /* Unsigned long int                    */
123.4 1e-2
'x' '\000' '\xhh' escape sequences
An example of a string would be:
char *Str = "String Constant";See the discussion on strings for more information.
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