Get input from users until it's negative, and then calculate their sum.(using while loop)-CodePudding

So the exercise is to get input from users until they enter a negative number and then calculate the sum of numbers before the negative one. (using while loop).

while True:
a = 0
summ = 0
while a >= 0:
    a = int(input("enter a number: "))
    summ = summ   a
    if a < 0:
        print(summ)

This was the code that I wrote for this exercise, but the problem is that it calculates the negative number too. I'm pretty new to python, and this is one of the python exercises that I should do to learn more about algorithms.

CodePudding user response：

You need use IF statements to check negative values

summ = 0
while True:
    a = int(input("enter a number: "))
    if a < 0:
        break
    summ = summ   a
    print(summ)

CodePudding user response：

state = True
summ = 0
while state:
    a = int(input("enter a number: "))
    if a >= 0:
        summ = summ   a
    else:
        state = False
        print(summ)

CodePudding user response：

Use the continue statement, which skips a given iteration

while True:
    a = 0
    summ = 0
    while a >= 0:
        a = int(input("enter a number: "))
        summ = summ   a
        if a < 0:
            continue
        print(summ)
    break