Decimal integer literals
A decimal integer literal contains any
of the digits 0 through 9. The first digit cannot be 0. Integer literals
beginning with the digit 0 are interpreted as an octal integer literal
rather than as a decimal integer literal.
A plus (+) or minus (-) symbol can precede a decimal integer literal. The operator is treated as a unary operator rather than as part of the literal.
The following are examples of decimal literals:
485976
-433132211
+20
5