#include int change(int* pnumber); /* Function prototype */ void main() { int number = 20; int* pnumber = &number; int result = 0; result = change(pnumber); printf("\nIn main, result = %d\tnumber = %d", result, number); } int change(int* pnumber) { *pnumber *= 2; printf("\n In function change, *pnumber = %d\n", *pnumber ); return *pnumber; } & indirizzo della variabile * la variabile puntata da