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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.

Contents

Parameters

arg - floating point value

Return value

Nearest integer not less than arg

Return value
math-ceil.svg
Argument

Notes

If the argument is infinity (positive or negative) or zero (positive or negative), the return value is the same as the argument.

The largest representable floating-point values are exact integers in all standard floating-point formats, so this function never overflows.

This function may, but is not required to, raise FE_INEXACT floating-point exceptions for non-integer arguments.

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

See also

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