Why the output is 26 not 23? Why did the value of (*p2) also change to 13?

Question

#include <iostream>
using namespace std;

int main() {
int a=10;
int b=13;
int *p1=&a;
int *p2=&a;
*p1=b;
cout<<(*p1)+(*p2);
return 0;
}

Answer 1

its like having two same copies of a box. If you change the contents, it will in the copy (technically its not a copy but hey, this is an analogy).