Segmentation fault

[prasoonthegreat]

Look at the following code....

#include<iostream>
using std::cout;
using std::endl;

const int size=3;

template<class T>
class vector
{
    T *v;

    public:

    vector()
    {
        v=new T[size];
	    for(int i=0;i<size;i++)
           v[i]=0;
       cout<<"Hello 1";
	}

    vector(T *a)
    {
		//v=new T[size];
        for(int i=0;i<size;i++)
	       v[i]=a[i];
    
	cout<<"Hello";
	}

	/*void operator=(const T *a)
	{
       for(int i=0;i<size;i++)
	       v[i]=a[i];
    }*/

    T operator*(const vector &y)
    {
        T prod=0;

        for(int i=0;i<size;i++)
           prod += this->v[i] * y.v[i];

        return prod;
    }
};

int main()
{
     int x[3]={1,2,3};
     int y[3]={4,5,6};

     float a[3]={1.7,2.3,3.2};
     float b[3]={1.9,2.4,3.8};

     

     vector <int> v1;
     vector <int> v2;

     vector <float> v3;
     vector <float> v4;

     v1=x;
     v2=y;

     v3=a;
     v4=b;
	 
     int Prod_Int = v1 * v2;

     float Prod_Float = v3 * v4;

     cout<<"Prod_Int = "<<Prod_Int<<endl;
     cout<<"Prod_Float = "<<Prod_Float<<endl;


     return 0;
}

In the above code....althoug h memory has been allocated to object v1 in the default constructor ......why do we need to allocate it again in the parametrized constructor???? ...otherwise i am getting a seg fault

[JosAH]

In the above code....althoug h memory has been allocated to object v1 in the default constructor ......why do we need to allocate it again in the parametrized constructor???? ...otherwise i am getting a seg fault

What happens in function f() doesn't automagically happen in function g() even if both f() and g() happen to be constructors.

btw. your thread belongs in the C/C++ topics forum (the 'answers' section). I'm sure some kind soul move it there.

kind regards,

Jos