Numeric values having no decimal parts are called integer literals. These values can be expressed in decimal, octal, and hexadecimal forms. By default, integer literals are in decimal form. The decimal form contains a sequence of decimal digits (0 to 9), the octal form contains a sequence of octal digits (0 to 7) prefixed by 0 (zero), whereas the hexadecimal form contains a sequence of hexadecimal digits (0 to 9, a to f) prefixed by 0x or 0X. In the hexadecimal form, the characters (a to f) may be in uppercase or lowercase.
By default, integer literals are 32-bit values. In order to indicate a 64-bit long value, the character L (either in uppercase or lower case) is appended to the literal.
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