| def choose_num(x, y): | |
| """This function takes two positive numbers x and y and returns the | |
| biggest even integer number that is in the range [x, y] inclusive. If | |
| there's no such number, then the function should return -1. | |
| For example: | |
| choose_num(12, 15) = 14 | |
| choose_num(13, 12) = -1 | |
| """ | |
| if x > y: | |
| return -1 | |
| if y % 2 == 0: | |
| return y | |
| if x == y: | |
| return -1 | |
| return y - 1 | |