The floor of 0.561 is 0. The floor of a number is the largest integer that is less than or equal to that number. In this case, 0 is the largest integer that is less than or equal to 0.561.
The ceiling of 0.561 is 1. The ceiling of a number is the smallest integer that is greater than or equal to that number. In this case, 1 is the smallest integer that is greater than or equal to 0.561