C++ math ceil library function

The ceil() function in C++ is used to return the next highest integer value by rounding up value if necessary.

C++ math ceil - Syntax

mixed ceil(mixed  n);

C++ math ceil - Parameter and Retun type

`mixed n`	Specifies the real number (int, long, float, double) / infinity (*Required)
`Return mixed`	Returns a number / infinity respective to an input argument.

Example: #1 - C++ math ceil

Round the floating point number from 1.0 to 2.0 step by 0.1 using ceiling math method and print the resultant in console.

C++ Input Screen

#include <iostream>
#include <math.h>

using namespace std;

int main(int argc, const char * argv[])
{
    // Positive floating point value
    cout << "The ceiling value of 1.0 is " << ceil(1.0) << endl;
    cout << "The ceiling value of 1.1 is " << ceil(1.1) << endl;
    cout << "The ceiling value of 1.2 is " << ceil(1.2) << endl;
    cout << "The ceiling value of 1.3 is " << ceil(1.3) << endl;
    cout << "The ceiling value of 1.4 is " << ceil(1.4) << endl;
    cout << "The ceiling value of 1.5 is " << ceil(1.5) << endl;
    cout << "The ceiling value of 1.6 is " << ceil(1.6) << endl;
    cout << "The ceiling value of 1.7 is " << ceil(1.7) << endl;
    cout << "The ceiling value of 1.8 is " << ceil(1.8) << endl;
    cout << "The ceiling value of 1.9 is " << ceil(1.9) << endl;
    cout << "The ceiling value of 2.0 is " << ceil(2.0) << endl;
      
    return 0;
}

C++ Output Screen

The ceiling value of 1.0 is 1

The ceiling value of 1.1 is 2

The ceiling value of 1.2 is 2

The ceiling value of 1.3 is 2

The ceiling value of 1.4 is 2

The ceiling value of 1.5 is 2

The ceiling value of 1.6 is 2

The ceiling value of 1.7 is 2

The ceiling value of 1.8 is 2

The ceiling value of 1.9 is 2

The ceiling value of 2.0 is 2

Example: #2 - C++ math ceil

Round the positive floating point number (random numbers) using ceiling math method and print the resultant in console.

C++ Input Screen

#include <iostream>
#include 

using namespace std;

int main(int argc, const char * argv[])
{
    // Positive floating point value
    cout << "The ceiling value of 1.5698 is " << ceil(1.5698) << endl;
    cout << "The ceiling value of 1.3093 is " << ceil(1.3093) << endl;
    cout << "The ceiling value of 1.0087 is " << ceil(1.0087) << endl;
    cout << "The ceiling value of 1.1038 is " << ceil(1.1038) << endl;
    cout << "The ceiling value of 1.9573 is " << ceil(1.9573) << endl;
    cout << "The ceiling value of 1.7462 is " << ceil(1.7462) << endl;
    cout << "The ceiling value of 1.6427 is " << ceil(1.6427) << endl;
    cout << "The ceiling value of 1.4128 is " << ceil(1.4128) << endl;
    cout << "The ceiling value of 1.8099 is " << ceil(1.8099) << endl;
    cout << "The ceiling value of 1.2743 is " << ceil(1.2743) << endl;
    cout << "The ceiling value of 2.0001 is " << ceil(2.0001) << endl;
      
    return 0;
}

C++ Output Screen

The ceiling value of 1.5698 is 2

The ceiling value of 1.3093 is 2

The ceiling value of 1.0087 is 2

The ceiling value of 1.1038 is 2

The ceiling value of 1.9573 is 2

The ceiling value of 1.7462 is 2

The ceiling value of 1.6427 is 2

The ceiling value of 1.4128 is 2

The ceiling value of 1.8099 is 2

The ceiling value of 1.2743 is 2

The ceiling value of 2.0001 is 3

Example: #3 - C++ math ceil

Round the negative floating point number (random numbers) using ceiling math method and print the resultant in console.

C++ Input Screen

#include <iostream>
#include <math.h>

using namespace std;

int main(int argc, const char * argv[])
{
    // Positive floating point value
    cout << "The ceiling value of -1.5698 is " << ceil(-1.5698) << endl;
    cout << "The ceiling value of -1.3093 is " << ceil(-1.3093) << endl;
    cout << "The ceiling value of -1.0087 is " << ceil(-1.0087) << endl;
    cout << "The ceiling value of -1.1038 is " << ceil(-1.1038) << endl;
    cout << "The ceiling value of -1.9573 is " << ceil(-1.9573) << endl;
    cout << "The ceiling value of -1.7462 is " << ceil(-1.7462) << endl;
    cout << "The ceiling value of -1.6427 is " << ceil(-1.6427) << endl;
    cout << "The ceiling value of -1.4128 is " << ceil(-1.4128) << endl;
    cout << "The ceiling value of -1.8099 is " << ceil(-1.8099) << endl;
    cout << "The ceiling value of -1.2743 is " << ceil(-1.2743) << endl;
    cout << "The ceiling value of -2.0001 is " << ceil(-2.0001) << endl;
      
    return 0;
}

C++ Output Screen

The ceiling value of -1.5698 is -1

The ceiling value of -1.3093 is -1

The ceiling value of -1.0087 is -1

The ceiling value of -1.1038 is -1

The ceiling value of -1.9573 is -1

The ceiling value of -1.7462 is -1

The ceiling value of -1.6427 is -1

The ceiling value of -1.4128 is -1

The ceiling value of -1.8099 is -1

The ceiling value of -1.2743 is -1

The ceiling value of -2.0001 is -2

Example: #4 - C++ math ceil

Round the infinity using ceiling math method and print the resultant in console.

C++ Input Screen

#include <iostream>
#include <math.h>
#include <limits>

using namespace std;

int main(int argc, const char * argv[])
{
    // Positive ∞ infinite value
    cout << "The ceiling value of inf is " << ceil(std::numeric_limits<float>::infinity()) << endl;

    // Negative ∞ infinite value
	cout << "The ceiling value of -inf is " << ceil(-std::numeric_limits<float>::infinity()) << endl;
      
    return 0;
}

C++ Output Screen

The ceiling value of inf is inf

The ceiling value of -inf is -inf

Related Tags:

cpp
cpp math funtions
ceil
ceiling value
math ceil
next highest integer
positive floating point
negative floating point
inf
positive infinity
negative infinity

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