In this C++ tutorial, you will learn how to find the ceiling value of given number using ceil() function of cmath, with syntax and examples.
C++ ceil()
C++ ceil() returns ceiling value of given number. Ceiling value is the smallest integer value greater than the given number.
Syntax
The syntax of C++ ceil() is
ceil(x)
where
| Parameter | Description |
|---|---|
| x | A double, float, long double, or integral type value. |
Returns
The return value depends on the type of value passed for parameter x. The return value of ceil(x) is
- double if x is double or integral type.
- float if x is float.
- long double if x is long double.
The synopsis of ceil() function is
double ceil(double x); float ceil(float x); long double ceil(long double x); double ceil(T x); // where T is integral type
ceil() is a function of cmath library. Include cmath library at the start of program, if using ceil() function.
Example
In this example, we read a double value from user into x, and find its ceiling value using ceil() function.
C++ Program
#include <iostream>
#include<cmath>
using namespace std;
int main() {
double x;
cout << "Enter a value : ";
cin >> x;
double result = ceil(x);
cout << "ceil(" << x << ") : " << result << endl;
} Output
Enter a value : 3.14 ceil(3.14) : 4 Program ended with exit code: 0
Enter a value : 4.896 ceil(4.896) : 5 Program ended with exit code: 0
Conclusion
In this C++ Tutorial, we learned the syntax of C++ ceil(), and how to use this function to find the ceiling value of given number, with the help of examples.