C++/Pointer/Pointer Array

Comparing Pointer Addresses

<source lang="cpp">

1. include <iostream>

using namespace std; const int Lengh = 3; int main () {

  int testScore[Lengh] = {4, 7, 1};
  int* intPointer = testScore;
  int i = 0;
  while (intPointer <= &testScore[Lengh - 1])
  {
     cout << "The address of index " << i
        << " of the array is "<< intPointer << endl;
     cout << "The value at index " << i
        << " of the array is "<< *intPointer << endl;
     intPointer++;
     i++;
  }
  return 0;

}

 </source>

Incrementing a Pointer

<source lang="cpp">

1. include <iostream>

using namespace std; const int Lengh = 3; int main () {

  int testScore[Lengh] = {4, 7, 1};
  int* intPointer = testScore;
  for (int i = 0; i < Lengh; i++, intPointer++)
  {
     cout << "The address of index " << i << " of the array is "<< intPointer << endl;
     cout << "The value at index " << i << " of the array is "<< *intPointer << endl;
  }
  return 0;

}

 </source>

Index a pointer as if it were an array.

<source lang="cpp">

1. include <iostream>
2. include <cctype>

using namespace std;

int main() {

 char *p; 
 int i; 
 char str[80] = "This Is A Test"; 

 cout << "Original string: " << str << endl; 

 p = str;                           // assign p the address of the start of the array 

 
 for(i = 0; p[i]; i++) {            // index p 
   if(isupper(p[i])) 
     p[i] = tolower(p[i]); 
   else if(islower(p[i])) 
     p[i] = toupper(p[i]); 
 } 

 cout << "Inverted-case string: " << str; 

 return 0; 

}

 </source>

The Array Name as a Constant Pointer

<source lang="cpp">

1. include <iostream>

using namespace std; const int Lengh = 3; int main () {

  int testScore[Lengh] = {4, 7, 1};
  cout << "The address of the array using testScore is " << testScore << endl;
  cout << "The address of the first element of the array using &testScore[0] is " << &testScore[0] << endl;
  
  cout << "The value of the first element of the array using *testScore is " << *testScore << endl; 
  
  cout << "The value of the first element of the array using testScore[0] is " << testScore[0] << endl;
  return 0;

}

 </source>

The name of the array is a constant pointer

<source lang="cpp">

1. include <iostream>

using namespace std; const int Lengh = 3; int main () {

  int testScore[Lengh] = {4, 7, 1};
  int* intPointer = testScore;
  for (int i = 0; i < Lengh; i++)
  {
     cout << "The address of index " << i << " of the array is "<< & intPointer[i] << endl;
     cout << "The value at index " << i << " of the array is "<< intPointer[i] << endl;
  }
  return 0;

}

 </source>

using array name as a constant pointer

<source lang="cpp">

1. include <iostream>

using namespace std; int main() {

   const int NUM_SCORES = 3;
   int highScores[NUM_SCORES] = {5, 3, 2};
   cout << "using array name as a constant pointer.\n";
   cout << *highScores << endl;
   cout << *(highScores + 1) << endl;
   cout << *(highScores + 2) << "\n\n";
   return 0;

}

 </source>

Using a Variable Pointer to Point to an Array

<source lang="cpp">

1. include <iostream>

using namespace std; const int Lengh = 3; int main () {

  int testScore[Lengh] = {4, 7, 1};
  for (int i = 0; i < Lengh; i++)
  {
     cout << "The address of index " << i << " of the array is "<< &testScore[i] << endl;
     cout << "The value at index " << i << " of the array is "<< testScore[i] << endl;
  }
  return 0;

}

 </source>