program_11_1.cpp

c++程序设计讲义 cppprograming 含源码

// Program 11.1: Swapping objects using indirection
#include <iostream>

using namespace std;

void IndirectSwap(char *Ptr1, char *Ptr2) {
    // swap the contents of the char objects to which
    // Ptr1 and Ptr2 point
    char c = *Ptr1;
    *Ptr1 = *Ptr2;
    *Ptr2 = c;
}
int main() {
    char a = 'y';
    char b = 'n';
    char *pa, *pb;
    pa = &a; pb = &b;
    // pass the lvalues of a and b to IndirectSwap()
    IndirectSwap(pa, pb);
    
    // display the new values of a and b
    cout << a << " " << b << endl;
    
    return 0;
}