End Zeros

Quiz>

Try to find out how many zeros a given number has at the end.

 

Input:

A positive Int

 

Output:

An Int.

 

Example:

end_zeros(0) == 1
end_zeros(1) == 0
end_zeros(10) == 1
end_zeros(101) == 0

 

def end_zeros(num: int) -> int:
    # your code here
    return None


if __name__ == '__main__':
    print("Example:")
    print(end_zeros(0))

    # These "asserts" are used for self-checking and not for an auto-testing
    assert end_zeros(0) == 1
    assert end_zeros(1) == 0
    assert end_zeros(10) == 1
    assert end_zeros(101) == 0
    assert end_zeros(245) == 0
    assert end_zeros(100100) == 2
    print("Coding complete? Click 'Check' to earn cool rewards!")

 

Solve Case 1>

1. num을 문자로 변환 후 우측에서부터 0을 제거해서 다른 숫자가 나올때까지 한 후 그 길이를 빼면 숫자가 나온다.

def end_zeros(num: int):
    return len(str(num)) - len(str(num).rstrip('0'))

 

Solve Case 2>

1. 초기값을 변수 n에 0을 지정

def end_zeros_2(num):
    n = 0

 

2. num을 문자로 변경하고 배열을 거꾸로 뒤집는다.

def end_zeros_2(num):
    n = 0

    for i in reversed(str(num)):

 

3. i가 0이면 변수 n에 값을 1씩 증가한다.

def end_zeros_2(num):
    n = 0

    for i in reversed(str(num)):
        if i == '0':
            n += 1

 

4. i가 0이 아니면 변수 n을 돌려주면서 for문 종료

def end_zeros_2(num):
    n = 0

    for i in reversed(str(num)):
        if i == '0':
            n += 1

        else:
            return n

 

5. 최종적으로 n을 리턴한다.

def end_zeros_2(num):
    n = 0

    for i in reversed(str(num)):
        if i == '0':
            n += 1
            
        else:
            return n

    return n

 

Code>

def end_zeros_2(num):
    n = 0

    for i in reversed(str(num)):
        if i == '0':
            n += 1
            
        else:
            return n

    return n

 

Example>

if __name__ == '__main__':
    print("Example:")
    print(end_zeros(0))

    # These "asserts" are used for self-checking and not for an auto-testing
    assert end_zeros(0) == 1
    assert end_zeros(1) == 0
    assert end_zeros(10) == 1
    assert end_zeros(101) == 0
    assert end_zeros(245) == 0
    assert end_zeros(100100) == 2
    print("Coding complete? Click 'Check' to earn cool rewards!")
    
    
  if __name__ == '__main__':
    print("Example:")
    print(end_zeros_2(0))

    # These "asserts" are used for self-checking and not for an auto-testing
    assert end_zeros_2(0) == 1
    assert end_zeros_2(1) == 0
    assert end_zeros_2(10) == 1
    assert end_zeros_2(101) == 0
    assert end_zeros_2(245) == 0
    assert end_zeros_2(100100) == 2
    print("Coding complete? Click 'Check' to earn cool rewards!")

 

Result Case 1>

Example:

1

Coding complete? Click 'Check' to earn cool rewards!

 

Result Case 2>

Example:

1

Coding complete? Click 'Check' to earn cool rewards!