For the Code Below Please someone explain How the value of variable 'number' bcame 64 when we print it for the second time?

Question

#include <iostream>

using namespace std;

void square(int&ptr){

ptr=ptr * ptr;

}

int main()
{
int number=8;
cout<<number<<endl;

square(number);
cout<<number;

return 0;

any help is appreciated..thank you
}

Answer 1

The & in the square function says that modifications on ptr are also done on number.