掌握利用栈实现十进制数转换成八进制数的运算。

Master the stack to achieve a decimal number converted to octal number of operation.

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此处int 类型的数在执行加法运算之前转换成double 类型。

Here, the int is converted to a double before addition.

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最后，再说个运算符**，它表示乘方，就是前一个数为底数，后一个数为指数的次幂运算。

Finally, the operator ** performs exponentiation; that is, it raises a number to a power.

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指出数值运算式的负值，或从一个数字减去一个数。

Indicates the negative value of a numeric expression or subtracts one number from another.

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指出数值运算式的负值，或从一个数字减去一个数。

Indicates the negative value of a numeric expression or subtracts one number from another.

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