numeric_limits::epsilon
函式會傳回這個區分1和大於的最小值之間的資料型別是可顯示的大於1。
static Type epsilon( ) throw( );
傳回值
介於1和大於的最小值之間的差異為資料型別是可顯示的大於1。
備註
值是型別的 floatFLT_EPSILON。 型別的epsilon 是最小的正浮點 N 這類+ Nepsilon + N 是可顯示的。
範例
// 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;
}
需求
標題: <limits>
命名空間: std