std::ceil

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Defined in header <cmath>

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float       ceil( float arg );

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double      ceil( double arg );

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long double ceil( long double arg );

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double      ceil( Integral arg );

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Computes nearest integer not less than arg.

Parameters

arg

-

floating point value

Return value

Nearest integer not less than arg

Notes

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

Example

Run this code

#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

See also

Template:cpp/numeric/math/dcl list floorTemplate:cpp/numeric/math/dcl list truncTemplate:cpp/numeric/math/dcl list round