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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': if num2 != 0: print(num1, "/", num2, "=", divide(num1, num2)) else: print("分母不能为0") else: print("非法输入")
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