Tutorialspoint.dev

Ceil and Floor functions in C++

In mathematics and computer science, the floor and ceiling functions map a real number to the greatest preceding or the least succeeding integer, respectively.

floor(x) : Returns the largest integer that is smaller than or equal to x (i.e : rounds downs the nearest integer).

// Here x is the floating point value.
// Returns the largest integer smaller 
// than or equal to x 
double floor(double x)  

Examples of Floor:

Input : 2.5
Output : 2

Input : -2.1
Output : -3

Input : 2.9
Output : 2
// C++ program to demonstrate floor function
#include <iostream>
#include <cmath>
using namespace std;
  
// Driver function
int main()
{
    // using floor function which return
    // floor of input value
    cout << "Floor is : " << floor(2.3) << endl;
    cout << "Floor is : " << floor(-2.3) << endl;
  
    return 0;
}

Output:

Floor is : 2
Floor is : -3

 



ceil(x) : Returns the smallest integer that is greater than or equal to x (i.e : rounds up the nearest integer).

// Here x is the floating point value.
// Returns the smallest integer greater 
// than or equal to x 
double ceiling(double x)  

Examples of Ceil:

Input : 2.5
Output : 3

Input : -2.1
Output : -2

Input : 2.9
Output : 3
// C++ program to demonstrate ceil function
#include <iostream>
#include <cmath>
using namespace std;
  
// Driver function
int main()
{
    // using ceil function which return
    // floor of input value
    cout << " Ceil is : " << ceil(2.3) << endl;
    cout << " Ceil is : " << ceil(-2.3) << endl;
  
    return 0;
}

Ceil is : 3
Ceil is : -2

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.



This article is attributed to GeeksforGeeks.org

You Might Also Like

leave a comment

code

0 Comments

load comments

Subscribe to Our Newsletter