算术表达式计算。输入多个整数，分别进行加、减、乘、除等运算。要求：参加运算的操作数个数可变；采用文本行和组合框数组；文本行和组合框均要响应事件，事件处理方法的计算时间相同；解决除数为0问题。-Arithmetic expressions. Enter multiple integer, respectively, add, subtract, multiply, and divide operations. Requirements: to participate in the operation variable number of operands　using the array of lines of text and combo boxes　lines of text and combo boxes have to be in response to an event, the event handler method of calculation time　solve the divisor is 0.