valarray::operator-
將、負號於valarray的每個項目的一元(Unary)運算子。
valarray<Type> operator-( ) const;
傳回值
項目是以這些作業陣列valarray。
範例
// valarray_op_eminus.cpp
// compile with: /EHsc
#include <valarray>
#include <iostream>
int main( )
{
using namespace std;
int i;
valarray<int> vaL ( 10 );
valarray<int> vaMINUS ( 10 );
for ( i = 0 ; i < 10 ; i += 2 )
vaL [ i ] = -i;
for ( i = 1 ; i < 10 ; i += 2 )
vaL [ i ] = i-1;
cout << "The initial valarray is: ( ";
for ( i = 0 ; i < 10 ; i++ )
cout << vaL [ i ] << " ";
cout << ")." << endl;
vaMINUS = -vaL;
cout << "The element-by-element result of "
<< "the operator+ is the\n valarray: ( ";
for ( i = 0 ; i < 10 ; i++ )
cout << vaMINUS [ i ] << " ";
cout << ")." << endl;
}
需求
標題: <valarray>
命名空間: std