编写一个程序，读取一个表达式作为输入，并打印出结果。只有整数和运营商下面是允许的表达式：

+ - ％（）

你的程序应该能够处理输入多例。- Write a program that reads an expression as input and print out the result. Only integers and operators below are allowed in the expression:

+-　 ( )

Your program should be able to deal with multiple cases of input.