Question

我刚开始为学校编程，这个作业要求我输入一个数字，然后用它从0到数字计数，然后选择数学运算，然后使用数学运算。

当我输入一个负数时会出现问题，它会给我正确的信息“太小 - 再试一次：”。但是一旦我输入一个正数，它仍然会将我原来的负数分配给该程序。

这是我的noobie代码：

num1 = int(input("\nEnter a number 1 or greater:\t"))
counting = num1 + 1


def count():
        print("Counting from 0 to", num1,":")
        for i in range(0,counting):
                print(i, end = ' ')
        math_op()


def reset():
        num1 = int(input("Too small - Try again: "))
        if num1 <= 0:
                reset()
        else:
                count() 

def math_op():

        ops = input("\n\nChoose math operation (+, -, *)")

        if ops in ('+'):
                print("Table for",num1,"using +:")
                for i in range(1,11):
                        print(num1 ,'+', i ,'=', num1 + i)                


        if ops in ('-'):
                print("Table for",num1,"using -:")
                for i in range(1,11):
                        print(num1 ,'-', i ,'=', num1 - i)              

        if ops in ('*'):
                print("Table for",num1,"using *:")
                for i in range(1,11):
                        print(num1 ,'*', i ,'=', num1 * i)                

if num1 <= 0:
        reset()
else:
        count()

Answer 1

是的，你错过了while循环：

num1 = -1
while num1 < 1:
    num1 = int(input("\nEnter a number 1 or greater:\t"))

# remaining code after here

Answer 2

当校正为正时，您从未设置要计数的数字：

def reset():
    num1 = int(input("Too small - Try again: "))
    if num1 <= 0:
        reset()
    else:
        counting = num1 + 1
        count()

我的程序没有认识到它使用负数

2 个答案: