个人psp作业1

#四则运算
import profile 
import random
def szys():
    yunsuan = ["+","-","*","/"]
    f= random.randint(0, 3)
    n1 = random.randint(1, 20)
    n2 = random.randint(1, 20)
    result = 0
    if f== 0:#加法
        result=n1+n2
    elif f == 1:#减法，要先比较大小，防止输出负数
        n1, n2 = max(n1, n2), min(n1, n2)
        result=n1-n2
    elif f== 2:#乘法
        result=n1*n2
    elif f == 3:#除法，要比较大小，并循环取整除
        if n1<n2:
            result=0
        else:
            result=int(n1/n2)
    print(n1, yunsuan[f], n2, '= ', end='')
    return result

print('输入"go"进行四则运算')
n=input()
#当输入go时，进行四则运算，调用函数syzs()
if n=="go":
    while True:
        result=szys()
        j= input()
        try:
            if int(j)== result :
                print('right')
            else:
                print('error.，the answer is', result )
        except:
            print("出现异常，结束运算")
            break