C++ complete and create magical square #include using namespace std; class Vec { public: Vec() { } int size() { return this->sz; } int capacity() { return this->cap; } void reserve( int n ) { //...

C++

complete and create magical square

#include

using namespace std;

class Vec

{
public:
Vec()
{

}


int size()
{
return this->sz;
}

int capacity()
{
return this->cap;
}

void reserve( int n )
{
// TODO:
// (0) check the n should be > size, otherwise
// ignore this action.
if ( n > sz )
{
// (1) create a new int array which size is n
// and get its address
int *newarr = new int[n];
// (2) use for loop to copy the old array to the
// new array

// (3) update the variable to the new address

// (4) delete old array
delete[] oldarr;

}

}

void push_back( int v )
{
// TODO:

if ( sz == cap )
{
cap *= 2;

reserve(cap);
}

// complete others

}

int at( int idx )
{

}

private:
int *arr;
int sz = 0;
int cap = 0;

};

int main()
{
Vec v;
v.reserve(10);
v.push_back(3);
v.push_back(2);
cout < v.size()="">< endl;="">
cout < v.capacity()="">< endl;="">
v.push_back(3);
v.push_back(2);
v.push_back(3);
v.push_back(4);
v.push_back(3);
v.push_back(7);
v.push_back(3);
v.push_back(8);
v.push_back(2);
cout < v.size()="">< endl;="">
cout < v.capacity()="">< endl;="">

for ( int i = 0; i < v.size();="" i++="">
{
cout < v.at(i)=""><>
}

return 0;
}