题解 | #表达式求值#

str1 = '+ - * / ) ( 0 1 2 3 4 5 6 7 8 9'
while True:
    try:
        #获取输入数据
        x1 = input()
        #设置标签检测数据合法性
        flag = 0
        if len(x1) > 100:
            flag = 1
        for word in x1:
            if word not in str1:
                flag = 1
                break
        x2 = eval(x1)
        #判断是否为整形运算
        if x2 != int(x2):
            flag = 1
        #如果输入数据不合法则跳出循环
        if flag == 1:
            break
        print(int(eval(x1)))


        
    except:
        break