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python - 基本计算器不适用于我的功能

问题描述

所以我在 Python 3.7 中编写了一个简单的计算器，但它不适用于我的函数。变量“输出”是灰色的，但我不知道为什么。

n1 = 0
n2 = 0
op = 0
res = 0
output = 0

# DEFINING FUNCTIONS

def askAndStore(aasText,var2save):
    print(aasText)
    var2save = input()

def calculate(num1,num2,op,output):
    if op == "add":
        output = float(num1) + float(num2)
    elif op == "sub":
        output = float(num1) - float(num2)
    elif op == "mul":
        output = float(num1) * float(num2)
    elif op == "div":
        output = float(num1) / float(num2)
    else:
        print("Error: Unknown operation")


# PROGRAM MAIN

askAndStore("What is the first number?", n1)
askAndStore("What is the second number?", n2)
askAndStore("What is the operation?", op)
calculate(n1, n2, op, res)
print(res)

我的输出是：

What is the first number?
10
What is the second number?
5
What is the operation?
add
Error: Unknown operation
0

Process finished with exit code 0

它总是显示“错误：未知操作”，即使我输入“添加”作为操作。任何想法为什么它不起作用？

标签： pythonpython-3.x

解决方案

n1 = float(input("What is the first number? "))
n2 = float(input("What is the second number? "))
op = str(input("What is the operation? "))

# DEFINING FUNCTIONS


def calculate(num1, num2, opr):
    if opr == "add":
        output = num1 + num2
    elif opr == "sub":
        output = num1 - num2
    elif opr == "mul":
        output = num1 * num2
    elif opr == "div":
        output = num1 / num2
    else:
        print("Error: Unknown operation")
    return output

print(calculate(n1, n2, op))

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