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std::floor

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Defined in header <cmath>
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float       floor( float arg );
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double      floor( double arg );
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long double floor( long double arg );
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double      floor( Integral arg );
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Computes nearest integer not greater than arg.

Contents

Parameters

arg - floating point value

Return value

Nearest integer not greater than arg

Return value
math-floor.svg
Argument

Notes

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

Example

#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

See also

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