Write a program using while loop, which prints the sum of every fifth number from 0 to 500 (including both 0 and 500)

Question

This is what I have done: Can anybody tell me where I went wrong?

num = 0
    x = 1
    while x <= 500:
        num += x
        x += 5

    print(num)

Answer 1

Your indentation is also wrong. It needs to be like this

num = 0
x = 0
while x <= 500:
        num += x
        x += 5
        print(num)

But, if you want to print only the final sum, you can use the print statement outside loop

num = 0
x = 0
while x <= 500:
        num += x
        x += 5
print(num)

Answer 2

Logic: We have to use while loop to check every number. We have to check whether the number is divisible by 5 or not, for that, we have to put if condition and keep on adding +1 to go from 0 to 500. If the condition is satisfied, add to to a variable whose initial value is 0. You code:

x=0
r=0
while x<=500:
    if x%5==0:
        r+=x
    x+=1
print(r)   

Or you can do it this way, start the initial value from 0, updating value of x should be 5, add it to variable whose initial value is 0. You alternative code:

x=0
r=0
while x<=500:
    r+=x
    x+=5
print(r)

The second code will help you rectify your personal code. Have a look

Answer 3

Yet another way:

x = 0
acc = 0
while (x := x + 5) <= 500:
    acc += x

Here we use an assignment operator inside while() to get the value while incrementing it at the same time.

Answer 4

it's simple using range(start, stop, step) with range(0, 500, 5) parameter as

# list of numbers
print([x for x in range(0, 501, 5)])

# sum of numbers
print(sum([x for x in range(0, 501, 5)]))

with while loop you can use := operator which is introduced in Python3.8 . it allows variable assignments within expressions.

total = 0
i = iter(range(5, 501, 5))
while val := next(i, None):
    if not val:
         break
    total += val

print('total : ', total)