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# Program to count odd numbers in an interval range using Python

Suppose we have two non-negative numbers left and right. We have to find the number of odd numbers between left and right (inclusive).

So, if the input is like left = 3, right = 15, then the output will be 7 because there are 7 odd numbers in range, these are [3,5,7,9,11,13,15], there are 7 elements.

To solve this, we will follow these steps −

if left is odd or right is odd, then

return 1 + quotient of (right-left) / 2

otherwise,

return quotient of (right-left) / 2

## Example (Python)

Let us see the following implementation to get better understanding −

def solve(left, right): if left % 2 == 1 or right % 2 == 1: return (right-left) // 2 + 1 else: return (right-left) // 2 left = 3 right = 15 print(solve(left, right))

## Input

3, 15

## Output

7

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