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 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")
