计算器减法和除法的结果错误

本文介绍了计算器减法和除法的结果错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我的加法和乘法工作正常。但是，对于减法，如果我输入2个数字3和1，答案将是-2，这显然是错误的。除法也无法正常运行。

My addition and multiplication work just fine. However, for subtraction, if I input 2 numbers, 3 and 1, the answer would be -2, which is obviously incorrect. Division is also not functioning properly.

我可以输入2个数字8和4，它会告诉我答案是0.5，这也是不正确的。

I can input 2 numbers, 8 and 4, and it would tell me the answer is 0.5, which is also incorrect.

我的代码出了什么问题？

What went wrong in my code?

print("Welcome to Calculator!") class Calculator: def addition(self,x,y): added = x + y return added def subtraction(self,x,y): subtracted = x - y return subtracted def multiplication(self,x,y): multiplied = x * y return multiplied def division(self,x,y): divided = x / y return divided 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("The answer is", sum) if operations == 2: s = 0 diff = 0 while s < x: number = int(input("Please enter number here: ")) s += 1 diff = calculator.subtraction(number,diff) print("The answer is", diff) if operations == 3: m = 0 prod = 1 while m < x: number = int(input("Please enter number here: ")) m += 1 prod = calculator.multiplication(number, prod) print("The answer is", prod) if operations == 4: d = 0 quo = 1 while d < x: number = int(input("Please enter number here: ")) d += 1 quo = calculator.division(number, quo) print("The answer is", quo)

推荐答案

if operations == 4: d = 0 quo = 1 while d < x: number = int(input("Please enter number here: ")) d += 1 quo = calculator.division(number, quo) print("The answer is", quo)

第一次通过 quo 变为8。然后再次以4作为数字和8作为 quo 。 4/8 = .5

The first time through quo becomes 8. Then it goes through again with 4 as number and 8 as quo. 4 / 8 = .5

这里是另一种选择解决方案使用 functools 库中的 reduce 。

Here's an alternative solution using reduce from the functools library.

if operations == 4: quo = 1 numbers = list() while len(numbers) < x: number = int(input("Please enter number here: ")) numbers.append(number) quo = reduce(calculator.division, numbers) print("The answer is", quo)

我想知道为什么当它被否决时确实是为什么除法不起作用的答案...

I'd like to know why this was downvoted when it is indeed the answer why division wasn't working...