numeric_limits::epsilon
The function returns the difference between 1 and the smallest value greater than 1 that is representable for the data type.
static Type epsilon( ) throw( );
Return Value
The difference between 1 and the smallest value greater than 1 that is representable for the data type.
Remarks
The value is FLT_EPSILON for type float. epsilon for a type is the smallest positive floating-point number N such that N + epsilon + N is representable.
Example
// numeric_limits_epsilon.cpp
// compile with: /EHsc
#include <iostream>
#include <limits>
using namespace std;
int main( )
{
cout << "The difference between 1 and the smallest "
<< "value greater than 1\n for float objects is: "
<< numeric_limits<float>::epsilon( )
<< endl;
cout << "The difference between 1 and the smallest "
<< "value greater than 1\n for double objects is: "
<< numeric_limits<double>::epsilon( )
<< endl;
cout << "The difference between 1 and the smallest "
<< "value greater than 1\n for long double objects is: "
<< numeric_limits<long double>::epsilon( )
<< endl;
}
The difference between 1 and the smallest value greater than 1 for float objects is: 1.19209e-007 The difference between 1 and the smallest value greater than 1 for double objects is: 2.22045e-016 The difference between 1 and the smallest value greater than 1 for long double objects is: 2.22045e-016
Requirements
Header: <limits>
Namespace: std