Source of swap1.cpp

Structures and functions

  1: //swap1.cpp
  2: //Illustrates an overloaded Swap function.

  4: #include <iostream>
  5: #include <string>
  6: using namespace std;


  9: void Swap
 10: (
 11:     int& first, //inout
 12:     int& second //inout
 13: )
 14: /**<
 15: Swaps the values in two variables.
 16: @pre <em>first</em> and <em>second</em> have been initialized.
 17: @post The values in <em>first</em> and <em>second</em have
 18: been interchanged.
 19: */
 20: {
 21:     int temp = first;
 22:     first = second;
 23:     second = temp;
 24: }


 27: void Swap
 28: (
 29:     double& first, //inout
 30:     double& second //inout
 31: )
 32: /**<
 33: Swaps the values in two variables.
 34: @pre <em>first</em> and <em>second</em> have been initialized.
 35: @post The values in <em>first</em> and <em>second</em have
 36: been interchanged.
 37: */
 38: {
 39:     double temp = first;
 40:     first = second;
 41:     second = temp;
 42: }


 45: void Swap
 46: (
 47:     string& first, //inout
 48:     string& second //inout
 49: )
 50: /**<
 51: Swaps the values in two variables.
 52: @pre <em>first</em> and <em>second</em> have been initialized.
 53: @post The values in <em>first</em> and <em>second</em have
 54: been interchanged.
 55: */
 56: {
 57:     string temp = first;
 58:     first = second;
 59:     second = temp;
 60: }


 63: int main()
 64: {
 65:     int a = 7, b = 9;
 66:     double x = 2.3, y = 7.4;
 67:     string firstName = "John", lastName = "Henry";

 69:     cout << "\na is " << a << " and b is " << b << ".\n";
 70:     Swap(a, b);
 71:     cout << "Now a is " << a << " and b is " << b << ".\n\n";

 73:     cout << "x is " << x << " and y is " << y << ".\n";
 74:     Swap(x, y);
 75:     cout << "Now x is " << x << " and y is " << y << ".\n\n";

 77:     cout << "firstName is " << firstName 
 78:          << " and lastName is " << lastName << ".\n";
 79:     Swap(firstName, lastName);
 80:     cout << "Now firstName is " << firstName
 81:          << " and lastName is " << lastName << ".\n\n";

 83:     cout << "\nPress Enter to continue ... ";  cin.ignore(80, '\n');
 84: }