C++ Tutorial/Data Types/int pointer

Calculation based on pointer

<source lang="cpp">#include <iostream> using namespace std;

int main() {

 int *p, num; 

 p = # 

 *p = 100; 
 cout << num << " "; 
 (*p)++; 
 cout << num << " "; 
 (*p)--; 
 cout << num << "\n"; 

 return 0; 

}</source>

100 101 100

Get address of an int variable

<source lang="cpp">#include <iostream> using namespace std;

int main() {

 int total; 
 int *ptr; 
 int val; 

 total = 3200; // assign 3,200 to total 

 ptr = &total; // get address of total 

 val = *ptr;   // get value at that addres  

 cout << "Total is: " << val << "\n"; 

 return 0; 

}</source>

Total is: 3200

Using int pointers

<source lang="cpp">#include <iostream>

using std::cout; // this file uses std::cout

int main()
{
    int intValue;         // a variable
    int * intPointer = 0;    // a pointer

    intValue = 5;
    intPointer = &intValue;     // assign address of intValue to intPointer
    cout << "intValue: " << intValue << "\n";
    cout << "*intPointer: " << *intPointer << "\n\n";

    cout << "*intPointer = 7\n";
    *intPointer = 7;         // sets intValue to 7
    cout << "*intPointer: " << *intPointer << "\n";
    cout << "intValue: " << intValue << "\n\n";

    cout << "intValue = 9\n";
    intValue = 9;
    cout << "intValue: " << intValue << "\n";
    cout << "*intPointer: " << *intPointer << "\n";

    return 0;
}</source>

intValue: 5
*intPointer: 5
*intPointer = 7
*intPointer: 7
intValue: 7
intValue = 9
intValue: 9
*intPointer: 9