
Today I am Going to Show you How to Use Pointers for Calculations in C++ ..
Ok..
This Calculation Without Using Pointers ..:
#include <iostream> using namespace std; int main() { int x,y,z; cout << "\nx: "; cin >> x; cout << "\ny: "; cin >> y; if (x>y) { z=x+y; cout << "\nz=" << z; } else { z=x-y; cout << "\nz=" << z; } cout << "\n\n"; return 0; }If We Execute This Part of Code ..It'll Ask Us to Give a Value for "x and y" ..Than It'll Compare the Given Values if "x>y" .. If That Is True, "z" Will be Calculated as "x+y" else "z" Will be Calculated as "x-y" .. Than Finally It Will Display the Value of "z" ..
Now Let's See How We Can Do It Using Pointers:
the First Part of the Program Would be:
#include <iostream> using namespace std; int main() {Than After This, We Declare the Variables we Need During the Calculation ..
#include <iostream> using namespace std; int main() { [B]int x,y,z,*a,*b;[/B]As We See .. I've Declared Two Pointers (a,b) .. In Which the Address of "x" and "y" Will Be Saved..
Than ..
#include <iostream> using namespace std; int main() { int x,y,z,*a,*b; [B]cout << "\nx: "; cin >> x; [/B] [B] a=&x; [/B] [B] cout << "\ny: "; cin >> y; [/B] [B] b=&y;[/B]Now Using " cin >> x and cin >> y " .. I've Asked From the User to Give Values for "x" and "y" ..
And Then the Address of the Given Values Will be Saved to the Pointers (a,

Now the Calculation Part:
#include <iostream> using namespace std; int main() { int x,y,z,*a,*b; cout << "\nx: "; cin >> x; a=&x; cout << "\ny: "; cin >> y; b=&y; [B]if (x>y) { z=*a+*b; cout << "\nz=" << z; } else { z=*a-*b; [/B] [B] cout << "\nz=" << z; }[/B] cout << "\n\n"; return 0; }Using "x>y" the Computer Will Compare the Two Variables and Will Look If the Value of "x" is Bigger than the Value of "y" .. and If It's True..
z=*a+*b;..
*a = the Value Saved in Pointer "a" and
*b = the Value Saved in Pointer "b" ..
else
z=*a-*b;..
Finally, the Value of "z" will be Shown .. using:
cout << "\nz=" << z;..Here's a Screenshot:

Thanks,
Egz0N ..!!