59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
// swaps.cpp -- swapping with references and with pointers
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#include <iostream>
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void swapr(int & a, int & b); // a, b are aliases for ints
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void swapp(int * p, int * q); // p, q are addresses of ints
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void swapv(int a, int b); // a, b are new variables
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int main()
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{
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using namespace std;
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int wallet1 = 300;
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int wallet2 = 350;
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cout << "wallet1 = $" << wallet1;
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cout << " wallet2 = $" << wallet2 << endl;
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cout << "Using references to swap contents:\n";
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swapr(wallet1, wallet2); // pass variables
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cout << "wallet1 = $" << wallet1;
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cout << " wallet2 = $" << wallet2 << endl;
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cout << "Using pointers to swap contents again:\n";
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swapp(&wallet1, &wallet2); // pass addresses of variables
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cout << "wallet1 = $" << wallet1;
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cout << " wallet2 = $" << wallet2 << endl;
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cout << "Trying to use passing by value:\n";
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swapv(wallet1, wallet2); // pass values of variables
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cout << "wallet1 = $" << wallet1;
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cout << " wallet2 = $" << wallet2 << endl;
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// cin.get();
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return 0;
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}
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void swapr(int & a, int & b) // use references
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{
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int temp;
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temp = a; // use a, b for values of variables
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a = b;
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b = temp;
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}
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void swapp(int * p, int * q) // use pointers
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{
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int temp;
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temp = *p; // use *p, *q for values of variables
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*p = *q;
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*q = temp;
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}
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void swapv(int a, int b) // try using values
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{
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int temp;
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temp = a; // use a, b for values of variables
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a = b;
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b = temp;
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}
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