函数中迭代的问题

Question

我正在为类进行的任务是要求我们制作一个程序，通过重复减法计算整数除法（就像乘法等于重复加法一样）。到目前为止，除了用户想要计算商的次数以外，所有的工作都很好。

由于某些原因，程序总是运行一次，而不是我提示程序在for循环中执行的迭代次数/输入次数。

我可以得到一些帮助吗？我是新的函数，所以我确定该程序的可读性不如它，但我需要确定的是我的get_num_of_inputs（）函数和/或num_of_inputs变量有什么问题。

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

你的逻辑有点纠结。没有必要将num_of_inputs传递给calc_quotient函数。相反，您需要创建一个for循环，循环num_of_inputs次。在循环内部，您会得到一个新分子和分母，请拨打calc_quotient，然后输出结果。

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()