输入数据有若干组数据，每组数据由一个运算符（+、-、*、/、 ）和两个整数构成，如果运算符遇到‘@’,则表示运行结束。-There are a number of input data sets of data, each set of data by an operator (+,-,*, /, ), and two integers, if the operator encounters ' @' , it means the end of the run.