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
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
Ceil is : 3 Ceil is : -2
This article is contributed by Sahil Rajput. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
- Finding Floor and Ceil of a Sorted Array using C++ STL
- Precision of floating point numbers in C++ (floor(), ceil(), trunc(), round() and setprecision())
- Mathematical Functions in Python | Set 2 (Logarithmic and Power Functions)
- Mathematical Functions in Python | Set 1 (Numeric Functions)
- Functions in C/C++
- C++ Mathematical Functions
- Inline Functions in C++
- Searching in a map using std::map functions in C++
- Macros vs Functions
- Functions that cannot be overloaded in C++
- Pure Functions
- List in C++ | Set 2 (Some Useful Functions)
- How arrays are passed to functions in C/C++
- Builtin functions of GCC compiler
- strdup() and strndup() functions in C/C++