# What Is Floor and Ceiling in Data Structure?

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Scott Campbell

In data structure, the concepts of floor and ceiling play an important role when it comes to finding values in a given set of data. The floor and ceiling functions are mathematical functions that help us determine the closest values to a given number in a set or sequence.

Floor Function:
The floor function is denoted as ⌊x⌋, where x is the input value. It returns the largest integer that is less than or equal to x. In simpler terms, it rounds down the value of x to the nearest whole number.

For example, if we have x = 3.7, then its floor value would be 3 because 3 is the largest integer less than or equal to 3.7.

Use Case:
One common use case for the floor function is when dealing with real numbers in programming. Often, we need to limit decimal places or convert a floating-point number into an integer. In such cases, the floor function proves to be very helpful.

## Ceiling Function:

The ceiling function is denoted as ⌈x⌉, where x is the input value. It returns the smallest integer that is greater than or equal to x. In simpler terms, it rounds up the value of x to the nearest whole number.2, then its ceiling value would be 4 because 4 is the smallest integer greater than or equal to 3.2.

Use Case:
Similar to the floor function, the ceiling function also finds its application in various programming scenarios. For instance, when calculating bill amounts or quantities that need to be rounded up, we can utilize this function.

Difference between Floor and Ceiling:
The main difference between floor and ceiling lies in how they round off values.
– The floor function always rounds down the value to the nearest whole number.
– The ceiling function always rounds up the value to the nearest whole number.

### Example:

Consider a set of numbers: 2.5, 4.8, 7.2, and 9.1.

Using the floor function:
– The floor of 2.5 is 2. – The floor of 4.8 is 4.

– The floor of 7.2 is 7. – The floor of 9.1 is 9.

Using the ceiling function:
– The ceiling of 2.5 is 3. – The ceiling of 4.8 is 5.

– The ceiling of 7.2 is 8. – The ceiling of 9.1 is 10.

• The floor function always provides a smaller or equal value, while the ceiling function always provides a greater or equal value.
• Both functions are widely used in various programming languages and are essential tools when it comes to manipulating and working with numerical data.

In conclusion, understanding the concepts of floor and ceiling in data structure is crucial for dealing with real numbers and rounding off values in programming tasks. These functions simplify complex calculations and allow us to work with integers when necessary.