python - 函数迭代的问题

Question

我正在做的类作业要求我们编写一个程序，通过重复减法来计算整数除法(就像乘法相当于重复加法一样)。到目前为止，除了用户想要计算商的次数之外，一切都运行良好。

由于某种原因，程序总是只运行一次，而不是我提示程序在 for 循环中执行的迭代/输入次数。

我可以得到一些帮助吗？我是函数新手，所以我确信该程序的可读性不高，但我需要弄清楚的是我的 get_num_of_inputs() 函数和/或 num_of_inputs 变量出了什么问题。

谢谢!! :)

def main():
    num_of_inputs = get_num_of_inputs()
    numerator, denominator = get_input()
    quotient = calc_quotient(num_of_inputs, numerator, denominator)
    display_output(numerator, denominator, quotient)

def get_num_of_inputs():
    return int(input("What is the number of inputs?: "))

def get_input():
    numerator = int(input("\nEnter the numerator: "))
    denominator = int(input("Enter the denominator (must not be zero): "))
    return numerator, denominator

def calc_quotient(num_of_inputs, numerator, denominator):

    if denominator == 0:
        return print("Error: invalid input")

    if numerator == 0:
        return 0

    if denominator == 1:
        return numerator

    if denominator == -1:
        return -numerator

    numerator_abs = abs(numerator)
    denominator_abs = abs(denominator)

    for iterations in range(num_of_inputs):
        #case 1
        if numerator_abs > denominator_abs:
            result = 5
            acc = numerator_abs
            quotient = 0

            while result > 0:
                acc = acc - denominator_abs
                result = acc
                quotient += 1

            if result < 0:
                return quotient - 1

            if (numerator > 0 and denominator > 0) or (numerator < 0 and denominator < 0):
                return quotient

            if numerator_abs % denominator_abs == 0 and ((numerator > 0 and denominator < 0) \
                or (numerator < 0 and denominator > 0)):
                return -quotient

            if numerator_abs % denominator_abs > 0 and ((numerator > 0 and denominator < 0) \
                or (numerator < 0 and denominator > 0)):
                return -quotient - 1
        #case 2
        if denominator_abs > numerator_abs:

            if (numerator > 0 and denominator > 0) or (numerator < 0 and denominator < 0):
                return 0

            if (numerator > 0 and denominator < 0) or (numerator < 0 and denominator > 0):
                return -1
        #case 3
        if numerator_abs == denominator_abs:

            if (numerator > 0 and denominator > 0) or (numerator < 0 and denominator < 0):
                return 1

            if (numerator > 0 and denominator < 0) or (numerator < 0 and denominator > 0):
                return -1


def display_output(numerator, denominator, quotient):
    print("\nThe quotient of", numerator, "and", denominator, "is:", quotient)

main()

Answer 1

你的逻辑有点困惑。无需将 num_of_inputs 传递给 calc_quotient 函数。相反，您需要创建一个循环 num_of_inputs 次的 for 循环。在循环内，您将获得新的分子和分母，调用 calc_quotient 并输出结果。

在下面的代码中，我简化了 calc_quotient 函数。

def calc_quotient(numerator, denominator):
    if denominator == 0:
        raise ValueError("denominator can't be zero!")

    sign = -1 if numerator * denominator < 0 else 1
    numerator = abs(numerator)
    denominator = abs(denominator)

    quotient = 0
    while numerator >= denominator:
        numerator -= denominator
        quotient += 1
    return sign * quotient

def get_num_of_inputs():
    return int(input("What is the number of inputs?: "))

def get_input():
    numerator = int(input("\nEnter the numerator: "))
    denominator = int(input("Enter the denominator (must not be zero): "))
    return numerator, denominator

def display_output(numerator, denominator, quotient):
    print("\nThe quotient of", numerator, "and", denominator, "is:", quotient)

def main():
    num_of_inputs = get_num_of_inputs()
    for i in range(num_of_inputs):
        numerator, denominator = get_input()
        quotient = calc_quotient(numerator, denominator)
        display_output(numerator, denominator, quotient)


if __name__ == '__main__':
    main()