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# std::floor

From cppreference.com
< cpp‎ | numeric‎ | math

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

Computes nearest integer not greater than `arg`.

### [edit] Parameters

arg | - | floating point value

### [edit] Return value

Nearest integer not greater than `arg`

Return value
Argument

### [edit] Notes

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

### [edit] Example

Run this code

    #include <cmath>
    #include <iostream>

    int main()
    {
        std::cout << std::fixed;
        std::cout << std::floor(12.0) << '\n';
        std::cout << std::floor(12.1) << '\n';
        std::cout << std::floor(12.5) << '\n';
        std::cout << std::floor(12.9) << '\n';
        std::cout << std::floor(13.0) << '\n';
    }

Output:

    12.000000
    12.000000
    12.000000
    12.000000
    13.000000

### [edit] See also

ceil | nearest integer not less 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]

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