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

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.