猫史档案馆

    # 定义函数
def add(x, y):
   return x + y
 
def subtract(x, y):
   return x - y
 
def multiply(x, y):
   return x * y
 
def divide(x, y):
   return x / y
 
# 提示用户输入
print("选择运算.")
print("1.相加")
print("2.相减")
print("3.相乘")
print("4.相除")
 
# 获取用户输入
choice = input("输入您的选择(1/2/3/4):")
 
num1 = float(input("输入第一个数字: "))
num2 = float(input("输入第二个数字: "))
 
# 根据用户输入执行相应的操作
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")