operator* (<valarray>)

取得兩同樣大小的valarrays的對應項目的產品或之間valarray之間的值。

template<class Type>
   valarray<Type> operator*(
      const valarray<Type>& _Left,
      const valarray<Type>& _Right
   );
template<class Type>
   valarray<Type> operator*(
      const valarray<Type>& _Left,
      const Type& _Right
   );
template<class Type>
   valarray<Type> operator*(
      const Type& _Left,
      const valarray<Type>& _Right
   );

參數

• _Left
  項目要乘以的或要乘以的某個值與每個項目valarray的第一個valarrays。

• _Right
  項目要乘以的或要乘以的某個值與每個項目valarray的第二個兩valarrays。

傳回值

項目是項目 _Left 產品和 _Right.的valarray

範例

// valarray_op_eprod.cpp
// compile with: /EHsc
#include <valarray>
#include <iostream>

int main( )
{
   using namespace std;
   int i;

   valarray<int> vaL ( 8 ), vaR ( 8 );
   valarray<int> vaNE ( 8 );
   for ( i = 0 ; i < 8 ; i += 2 )
      vaL [ i ] =  2;
   for ( i = 1 ; i < 8 ; i += 2 )
      vaL [ i ] =  -1;
   for ( i = 0 ; i < 8 ; i++ )
      vaR [ i ] =  i;
   
   cout << "The initial Left valarray is: ( ";
      for (i = 0 ; i < 8 ; i++ )
         cout << vaL [ i ] << " ";
   cout << ")." << endl;

   cout << "The initial Right valarray is: ( ";
      for (i = 0 ; i < 8 ; i++ )
         cout << vaR [ i ] << " ";
   cout << ")." << endl;

   vaNE = ( vaL * vaR );
   cout << "The element-by-element result of "
        << "the multiplication is the\n valarray: ( ";
      for (i = 0 ; i < 8 ; i++ )
         cout << vaNE [ i ] << " ";
   cout << ")." << endl;
}

需求

標題: <valarray>

命名空間: std