std::ceil

From Cppreference

Computes nearest integer not less than arg.

[edit] Parameters

[edit] Return value

nearest integer not less than arg

[edit] Notes

The integer value can be always represented by the given floating point type.

[edit] Example

#include <cmath>
#include <iostream>
 
int main()
{
    double a = 12.0;
    std::cout << std::fixed;
    std::cout << std::ceil(12.0) << '\n';
    std::cout << std::ceil(12.1) << '\n';
    std::cout << std::ceil(12.5) << '\n';
    std::cout << std::ceil(12.9) << '\n';
    std::cout << std::ceil(13.0) << '\n';}

Output:

12.000000
13.000000
13.000000
13.000000
13.000000

[edit] See also