个算术表达式是由操作数(operand)、运算符(operator)和界限符(delimiter)组成的。

假设操作数是正整数，运算符只含加减乘除等四种运算符，界限符有左右括号和表达式起始、结束符"#"，如：#（7+15）*（23-28/4）#。

引入表达式起始、结束符是为了方便。编程利用"算符优先法"求算术表达式的值。-In arithmetic expressions by the operand (operand), operator (operator) and the Limits of Fu (delimiter), composed of. Assumptions operand is a positive integer, operator calculation containing only four operators, Boundary Fu around brackets and expressions are the starting and end at # , Such as:# (7+ 15)* (23-- 28/4)#. The introduction of expression start and end address for convenience. Programming using　operator priority method　seek the value of the arithmetic expression.