interger,floating point,character constants

interger constants:
integer constants take one of the following forms:

• a decimal number e.g 1,123,100002.
• an octal number e.g.,01,01273,0303242.anoctal constant is introduced by a leading 0 and the digits are 0 through 7
• a hexadecimal number e.g.,0X1,0X7b,0X186A2.a hex constant is introduced by a leading 0Xor 0x and the digits are 0 trough 9 followed by a through F
• a character constant

Floating point constants:

floating point constants take one of the following forms:

• a decimal number followed by a decimal point followed by another decimal number e.g.,1.0,1.9993,3.42
• a number like the previous but with an exponent part i.e  an e or E followed by a decimal number e.g 1.0e10,1.23e-2,1.00e+2

character constant:

• A character constant is a character enclosed in single quotes e.g, 'a','2'
• in a character constant a backslash character is treated specially it introduces an escape sequence
• these escape sequences are usually used to represent characters that are not easy to see when represented by themselves or need to be escaped for syntax reason