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Showing content from https://en.cppreference.com/w/cpp/language/../named_req/../numeric/math/ceil.html below:

std::ceil, std::ceilf, std::ceill - cppreference.com

(1) float       ceil ( float num );

double      ceil ( double num );

long double ceil ( long double num ); (until C++23)

constexpr /*floating-point-type*/
            ceil ( /*floating-point-type*/ num );

(since C++23)

float       ceilf( float num );

(2) (since C++11)
(constexpr since C++23)

long double ceill( long double num );

(3) (since C++11)
(constexpr since C++23) template< /*math-floating-point*/ V >

constexpr /*deduced-simd-t*/<V>

            ceil ( const V& v_num ); (S) (since C++26)

template< class Integer >
double      ceil ( Integer num );

(A) (constexpr since C++23)

1-3) Computes the least integer value not less than num. The library provides overloads of std::ceil for all cv-unqualified floating-point types as the type of the parameter.(since C++23)

A) Additional overloads are provided for all integer types, which are treated as double.

(since C++11) [edit] Parameters num - floating point or integer value [edit] Return value

If no errors occur, the smallest integer value not less than num, that is ⌈num⌉, is returned.

Return value

num

[edit] Error handling

Errors are reported as specified in math_errhandling.

If the implementation supports IEEE floating-point arithmetic (IEC 60559),

[edit] Notes

FE_INEXACT may be (but is not required to be) raised when rounding a non-integer finite value.

The largest representable floating-point values are exact integers in all standard floating-point formats, so this function never overflows on its own; however the result may overflow any integer type (including std::intmax_t), when stored in an integer variable. It is for this reason that the return type is floating-point not integral.

This function (for double argument) behaves as if (except for the freedom to not raise FE_INEXACT) implemented by the following code:

The additional overloads are not required to be provided exactly as (A). They only need to be sufficient to ensure that for their argument num of integer type, std::ceil(num) has the same effect as std::ceil(static_cast<double>(num)).

[edit] Example 
#include <cmath>
#include <iostream>
 
int main()
{
    std::cout << std::fixed
              << "ceil(+2.4) = " << std::ceil(+2.4) << '\n'
              << "ceil(-2.4) = " << std::ceil(-2.4) << '\n'
              << "ceil(-0.0) = " << std::ceil(-0.0) << '\n'
              << "ceil(-Inf) = " << std::ceil(-INFINITY) << '\n';
}

Output:

ceil(+2.4) = 3.000000
ceil(-2.4) = -2.000000
ceil(-0.0) = -0.000000
ceil(-Inf) = -inf
[edit] See also [edit] External links

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