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# std::ceil

From cppreference.com
< cpp‎ | numeric‎ | math

Defined in header `<cmath>` |  |
float ceil( float arg ); |  |
double ceil( double arg ); |  |
long double ceil( long double arg ); |  |
double ceil( Integral arg ); |  | (since C++11)

Computes nearest integer not less than `arg`.

### [edit] Parameters

arg | - | floating point value

### [edit] Return value

Nearest integer not less than `arg`

Return value
Argument

### [edit] 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.

### [edit] Example

Run this code

    #include <cmath>
    #include <iostream>

    int main()
    {
        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

floor | nearest integer not greater than the given value (function) [edit]
trunc (C++11) | nearest integer not greater in magnitude than the given value (function) [edit]
round lround llround (C++11)(C++11)(C++11) | nearest integer, rounding away from zero in halfway cases (function) [edit]
rint lrint llrint (C++11)(C++11)(C++11) | nearest integer using current rounding mode with exception if the result differs (function) [edit]
nearbyint (C++11) | nearest integer using current rounding mode (function) [edit]

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