While 循环用户输入?

本文介绍了While 循环用户输入?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

说明:创建一个程序，要求用户输入一系列数字.用户应该输入一个负数来表示系列结束.输入所有正数后，程序应显示它们的总和.

Instructions: Create a program that asks a user to enter a series of numbers. The user should enter a negative number to signal the end of the series. After all the positive numbers have been entered, the program should display their sum.

我使用的是 Python 2，Python IDLE

I am using Python 2, Python IDLE

我正在为此作业使用 while 循环.到目前为止，我制作了一个程序，当用户在 while 循环下输入一个正数时，收集该数字并继续添加它，直到用户输入一个负数.我试图找到一种方法将第一个用户输入包含到程序中.

I'm using a while loop for this assignment. So far, I made a program that is saying, while the user enters a positive number under the while loop, collect that number and keep adding it until the user enters a negative number. I am trying to find a way to include the first user input into the program.

print('This program calculates the sum of the numbers entered and ends
after inputting a negative number')
total = 0.00
number = float(input('Enter a number: '))
while number >= 0:
    print('Enter another positive value if you wish to continue. Enter a
    negative number to calculate the sum.')
    number = float(input('Enter a number: '))
    total = total + number
print('The sum is', total)

推荐答案

已将您的代码简化为以下内容.
在 while 循环中检查输入并在出现负值时退出.

Have reduced your code to the below.
Performs checking of input in while loop and exits upon negative value.

total = 0.00

while True:
    print('Enter another positive value if you wish to continue. Enter a negative number to calculate the sum.')
    number = float(input('Enter a number: '))
    if number >= 0: # Check for positive numbers in loop
        total += number
    else:
        break
print('The sum is', total)

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Negative