numeric_limits::infinity

正无限大的(如果有)表示类型为;否则为。

static Type infinity( ) throw( );

返回值

正无限大的(如果有)表示类型为;否则为。

备注

仅当 has_infinity 是 true，则返回值是有意义的。

示例

// numeric_limits_infinity.cpp
// compile with: /EHsc
#include <iostream>
#include <limits>

using namespace std;

int main( )
{
   cout << numeric_limits<float>::has_infinity <<endl;
   cout << numeric_limits<double>::has_infinity<<endl;
   cout << numeric_limits<long double>::has_infinity <<endl;
   cout << numeric_limits<int>::has_infinity <<endl;
   cout << numeric_limits<__int64>::has_infinity <<endl;

   cout << "The representation of infinity for type float is: "
        << numeric_limits<float>::infinity( ) <<endl;
   cout << "The representation of infinity for type double is: "
        << numeric_limits<double>::infinity( ) <<endl;
   cout << "The representation of infinity for type long double is: "
        << numeric_limits<long double>::infinity( ) <<endl;
}

要求

标头: <limits>

命名空间: std

请参见

参考

strstreambuf Class