Как найти количество нечетных цифр в числе

Here is another technique i used to follow. Basically to find the number of odd/even integers in a range, just pick up the first odd/even and last odd/even in that range. Say for example i need to find out the number of odd integers in the range 100 to 150 (inclusive).

1. Pick the first odd integer -> 101
2. Pick the last odd integer -> 149
3. Find the difference -> 149-101= 48
4. Divide by the interval(in this case 2, since the positive difference between any two odd integers is 2). So -> 48/2 = 24
5. Add 1 for an inclusive range, -> 24+1=25, This is the step we usually do for all inclusive problems.

This will work for 1-100 like, range(1-99)-> 99-1=98 -> 98/2=49 -> 49+1 = 50.

NOTE: For exclusive set, you should consider if the numbers you pick lie inside the interval in order to consider it as an inclusive set. If its confusing, lets say the above range 100 to 150 is not inclusive, we still pick up numbers 101 and 149 and they lie within the range, so the inclusive property continues here also. But what if i need to find the number of even integers in this range?
Same procedure can be used,
1. Pick first and last even integer, 100 and 150
2. 150-100 = 50
3. 50/2 = 25
4. If it is inclusive set, add 1 -> 25+1=26
5. If it is an exclusive set, subtract 1 -> 25-1=24

Don’t be confused, its just a basic understanding of ranges, read it once more. This is actually very easy and reliable method.

This can be used not only for odd/even integers in a range but also for one of the example given above.
How many integers of the form 5k+2 are there from 1 to 200?

Starting from k=0, 5(0)+2 = 2 and the last term will be 197, since we need a (multiple of 5)+2 -> 5(39)+2=195+2
The range would look like 2, 7, 12, … 197
Again our technique,
197-2 = 195
Divide by 5 in this case, since the positive difference is 5
So 195/5=39
Add 1, 39+1=40, Got the answer!!!

Перейти к содержанию

number = int(input('Введите число: '))
# Для чётных цифр
even = 0
# Для нечётных цифр
odd = 0

number = int(input('Введите число: '))

even = 0
odd = 0

while number > 0:

number = int(input('Введите число: '))

even = 0
odd = 0

while number > 0:
    if number % 2 == 0:
        even += 1
    else:
        odd += 1

number = int(input('Введите число: '))

even = 0
odd = 0

while number > 0:
    if number % 2 == 0:
        even += 1
    else:
        odd += 1
    number = number // 10

number = int(input('Введите число: '))

even = 0
odd = 0

while number > 0:
    if number % 2 == 0:
        even += 1
    else:
        odd += 1
    number = number // 10

print(f'Количество чётных цифр: {even}')
print(f'Количество нечётных цифр: {odd}')