算术运算符即算术运算符号。是完成基本的算术运算 (arithmetic operators) 符号，就是用来处理四则运算的符号。
为可空类型提供类库支持，包括转换运算符和算术运算符。
Library Support for nullable types, including conversion operators and arithmetic operators.
只能使用四个二元算术运算符(加、减、乘、除)。
Only the four usual binary arithmetic operations (addition, subtraction, multiplication and division) are allowed.
只要没有混合的类型表达式，就可以在常数说明中使用算术运算符。
You can use arithmetic operators within your constant declarations as long as there are no mixed type expressions.
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