IntegerLiteral expects to immediately encounter an integer in the input stream, else the expression would be invalid.

integerLiteral希望在输入流中立即遇到一个整数，否则该表达式将无效。

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If an invalid digit is passed to octal integer (I. E. 8 or 9), the rest of the number is ignored.

如果向八进制数传递了一个非法数字(即8或9)，则后面其余数字会被忽略。

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If an invalid digit is passed to octal integer (I. E. 8 or 9), the rest of the number is ignored.

如果向八进制数传递了一个非法数字(即8或9)，则后面其余数字会被忽略。

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