设计一个可以进行四则运算的简单计算器。该计算器除了可以进行加、减、乘、除、求模（取余）等简单的四则运算外，还要求可以进行四则混合连算，并具有符合计算器日常使用习惯的容错纠错功能-Design an arithmetic of simple calculator. In addition to the calculator can add, subtract, multiply and divide, modulus (take over) such as simple arithmetic, also requires can be mixed to four even, and with fault tolerance in accordance with the calculator daily habits error correction function