Tutorial dan Contoh Pointers ke Structure Pemrograman C++

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A pointer variable can be created not only for native types like (int, float, double etc.) but they can also be created for user defined types like structure.
C++ Structure, Structure and Function, C++ Pointers to Structure, C++ Enumeration
For example:
#include <iostream>
using namespace std;
struct temp {
int i;
float f;
};
int main() {
temp
*ptr;
return 0;
}
This program creates a pointer ptr of type structure temp.

Example 1: Pointers to Structure

#include <iostream>
using namespace std;
struct Distance {
int feet;
float inch;
};
int main() {
Distance *ptr, d;

ptr
= &d;

cout
<< "Enter feet: ";
cin
>> (*ptr).feet;
cout
<< "Enter inch: ";
cin
>> (*ptr).inch;

cout
<< "Displaying information." << endl;
cout
<< "Distance = " << (*ptr).feet << " feet " << (*ptr).inch << " inches";

return 0;
}

Output
Enter feet: 4
Enter inch: 3.5
Displaying information.
Distance = 4 feet 3.5 inches
In this program, a pointer variable ptr and normal variable d of type structure Distance is defined. The address of variable d is stored to pointer variable, that is, ptr is pointing to variable d. Then the member function of variable d is accessed using pointer.

Note: Since pointer ptr is pointing to variable d in this program, (*ptr).inch and d.inch is exact same cell. Similarly, (*ptr).feet and d.feet is exact same cell.
The syntax to access member function using pointer is ugly and there is alternative notation -> which is more common.
ptr->feet is same as (*ptr).feet
ptr->inch is same as (*ptr).inch


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