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7.0

pointers

Asked by Troudeloup in C++ Programming Language, Microsoft Development

// more pointers
#include <iostream>
using namespace std;

int main ()
{
int firstvalue = 5, secondvalue = 15;
int * p1, * p2;

p1 = &firstvalue; // p1 = address of firstvalue
p2 = &secondvalue; // p2 = address of secondvalue
*p1 = 10; // value pointed by p1 = 10
*p2 = *p1; // value pointed by p2 = value pointed by p1
p1 = p2; // p1 = p2 (value of pointer is copied)
*p1 = 20; // value pointed by p1 = 20

cout << "firstvalue is " << firstvalue << endl;
cout << "secondvalue is " << secondvalue << endl;
return 0;
}

when run, it prints this:

firstvalue is 10
secondvalue is 20

I understand how the first value becomes 10, but can you write in English for me, how value two became 20 ?

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pointers

Asked by Troudeloup in C++ Programming Language, Microsoft Development

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