Function ceil() in C++
ceil Function of cmath Header File in C++
On this page we will discuss about function ceil() which is used in C++. The cmath header file is a C++ standard library header file that contains a set of math functions and macro definitions that are used to perform mathematical operations. The ceil function returns the smallest integer that is greater than or equal to a given number.
ceil() Function in C++
In C++ programming language the ceil function is included in cmath header file.
It is used to round a number up to the next integer and the range of the ceil function is the set of all real numbers. The datatype of parameter can be double/ float/ long double only.
Declaration of ceil function
double ceil(double x)
Parameters of ceil function
The ceil function takes a single argument of type double.
| Parameter | Description |
|---|---|
| x | It is the number that you want to round up to the next integer. |
Return value of ceil function
The ceil function returns a value of type double, which is the smallest integer that is greater than or equal to the input number.
Implementation of ceil function in C++
Example 1:
The following code shows the use of ceil function.
Run
#include <iostream>
#include <cmath>
using namespace std;
int main() {
// Initializing parameter
double x = 4.6;
double y = ceil(x);
cout << "The smallest integer greater than or equal to " << x << " is " << y << endl;
return 0;
}
Output:
The smallest integer greater than or equal to 4.6 is 5
Example 2:
Run
#include <iostream>
#include <cmath>
using namespace std;
int main() {
// Negative floating point number as parameter
double x = -3.2;
double y = ceil(x);
cout << "The smallest integer greater than or equal to " << x << " is " << y << endl;
// Integer as parameter
int z = 4;
int w = ceil(z);
cout << "The smallest integer greater than or equal to " << z << " is " << w << endl;
return 0;
}
Output:
The smallest integer greater than or equal to -3.2 is -3 The smallest integer greater than or equal to 4 is 4
Note:
The ceil function rounds up to the next integer, so if the input number is already an integer, the function will return the same value.
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