The `floor()` and `ceil()` methods are found in the `cmath` header file.

# floor()

The **`floor()` method** returns the largest possible integer *less than or equal to* the number passed as an argument.

## Code

#include <iostream>
#include <cmath>

using namespace std;

int main() {
  cout << "Floor of -1.5 is " << floor(-1.5) << endl;
  cout << "Floor of 5.9 is " << floor(5.9) << endl;
  
  return 0;
}

# ceil()

The **`ceil()` function** returns the smallest possible integer *greater than or equal to* the number passed as an argument.

## Code

#include <iostream>
#include <cmath>

using namespace std;

int main() {
  cout << "Ceiling of -3.3 is " << ceil(-3.3) << endl;
  cout << "Ceiling of 8.1 is " << ceil(8.1) << endl;
  
  return 0;
}

What are the floor() and ceil() functions in C++?

floor() returns the largest integer less than or equal to a number, while ceil() returns the smallest integer greater than or equal to it.