# Filename : test.py

# author by : www.dida100.com

# 定义函数

def add(x, y):

   """相加"""

   return x + y

def subtract(x, y):

   """相减"""

   return x - y

def multiply(x, y):

   """相乘"""

   return x * y

def divide(x, y):

   """相除"""

   return x / y

# 用户输入

print("选择运算：")

print("1、相加")

print("2、相减")

print("3、相乘")

print("4、相除")

choice = input("输入你的选择(1/2/3/4):")

num1 = int(input("输入第一个数字: "))

num2 = int(input("输入第二个数字: "))

if choice == '1':

   print(num1,"+",num2,"=", add(num1,num2))

elif choice == '2':

   print(num1,"-",num2,"=", subtract(num1,num2))

elif choice == '3':

   print(num1,"*",num2,"=", multiply(num1,num2))

elif choice == '4':

   print(num1,"/",num2,"=", divide(num1,num2))

else:

   print("非法输入")