c++ int with star code example
Example 1: c++ dereference a pointer
int number;
int value;
int * pNumber;
number = 5;
pNumber = &number;
assert(pNumber); // check before dereferenceing to prevent errors
value = *pNumber // Use * to dereference the pointer
Example 2: c++ pointers
#include <iostream>
using namespace std;
// isualize this on http://pythontutor.com/cpp.html#mode=edit
int main()
{
double* account_pointer = new double;
*account_pointer = 1000;
cout << "Allocated one new variable containing " << *account_pointer
<< endl;
cout << endl;
int n = 10;
double* account_array = new double[n];
for (int i = 0; i < n; i++)
{
account_array[i] = 1000 * i;
}
cout << "Allocated an array of size " << n << endl;
for (int i = 0; i < n; i++)
{
cout << i << ": " << account_array[i] << endl;
}
cout << endl;
// Doubling the array capacity
double* bigger_array = new double[2 * n];
for (int i = 0; i < n; i++)
{
bigger_array[i] = account_array[i];
}
delete[] account_array; // Deleting smaller array
account_array = bigger_array;
n = 2 * n;
cout << "Now there is room for an additional element:" << endl;
account_array[10] = 10000;
cout << 10 << ": " << account_array[10] << endl;
delete account_pointer;
delete[] account_array; // Deleting larger array
return 0;
}