c++数组的 堆初始化方式

//by 鸟哥 
//数组的 堆初始化总结
//有疑问请留言或加群 1032082534
#include                              
#include                                 
#include                                
#include                               
#include  
#include
#include 

//#include
using namespace std;
void print(double array[], int size)
{
    cout<<"size:"<<size<<endl;
    for (int i = 0; i < size; i++)
    {
        cout <<  array[i]<<"  ";
    }
    cout<<endl;
}

int main()
{  
    
    //1. 
    double* arr1 =new double[4] ;
    print(arr1,4);
    // 2
    double* arr2 =new double[4]() ;
    print(arr2,4);
    
    //3. 
    double* arr3=new double[4]{1,2};
    print(arr3,4);    
    
    //4. 
    double* arr4 = new double[]{1,2,3};
    print(arr4,3);
    
}


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运行结果：

size:4
0 0 0 0
size:4
0 0 0 0
size:4
1 2 0 0
size:3
1 2 3