计算器功能不输出任何内容

Question

我需要设计一个具有以下 UI 的计算器：

Welcome to Calculator!
1  Addition
2  Subtraction
3  Multiplication
4  Division
Which operation are you going to use?: 1
How many numbers are you going to use?: 2
Please enter the number: 3
Please enter the number: 1
The answer is 4.

这是我目前所拥有的：

print("Welcome to Calculator!")

class Calculator:
    def addition(self,x,y):
        added = x + y
        return sum
    def subtraction(self,x,y):
        diff = x - y
        return diff
    def multiplication(self,x,y):
        prod = x * y
        return prod
    def division(self,x,y):
        quo = x / y
        return quo


calculator = Calculator()

print("1 \tAddition")
print("2 \tSubtraction")
print("3 \tMultiplication")
print("4 \tDivision")
operations = int(input("What operation would you like to use?:  "))

x = int(input("How many numbers would you like to use?:  "))

if operations == 1:
    a = 0
    sum = 0
    while a < x:
        number = int(input("Please enter number here:  "))
        a += 1
        sum = calculator.addition(number,sum)

我真的需要一些帮助！ Python 3 中的所有计算器教程都比这简单得多（因为它只需要 2 个数字，然后简单地打印出答案）。

我需要帮助来获取我制作的 Calculator 类中的函数。当我尝试运行我目前拥有的东西时，它可以让我输入我的数字和诸如此类的东西，但它就结束了。它不运行操作或其他任何东西。我知道我到目前为止只有加法，但如果有人能帮我弄清楚加法，我想我可以做剩下的。

Answer 1

代码原样不起作用。在addition 函数中，您返回变量sum，这将与sum 函数中的构建冲突。

所以只需返回添加的内容，通常避免使用 sum，使用类似 sum_ 的内容：

这对我来说很好用：

print("Welcome to Calculator!")

class Calculator:
    def addition(self,x,y):
        added = x + y
        return added
    def subtraction(self,x,y):
        diff = x - y
        return diff
    def multiplication(self,x,y):
        prod = x * y
        return prod
    def division(self,x,y):
        quo = x / y
        return quo

calculator = Calculator()

print("1 \tAddition")
print("2 \tSubtraction")
print("3 \tMultiplication")
print("4 \tDivision")
operations = int(input("What operation would you like to use?:  "))

x = int(input("How many numbers would you like to use?:  "))

if operations == 1:
    a = 0
    sum_ = 0
    while a < x:
        number = int(input("Please enter number here:  "))
        a += 1
        sum_ = calculator.addition(number,sum_)

    print(sum_)

跑步：

$ python s.py
Welcome to Calculator!
1   Addition
2   Subtraction
3   Multiplication
4   Division
What operation would you like to use?:  1
How many numbers would you like to use?:  2
Please enter number here:  45
Please enter number here:  45
90

Answer 2

您的程序接受输入，运行一系列操作，然后结束而不显示结果。在while循环结束后尝试print(sum)之类的东西。