Answer to Question 2.10
001: /* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
002: /* The C++ Answer Book */
003: /* Tony Hansen */
004: /* All rights reserved. */
//:2_11a.c
// swap two integers
// version 1
void swapints(int *a, int *b)
{
int t = *a;
*a = *b;
*b = t;
}
//: version 1
#include <stream.h>
#include "2_11a.c"
main()
{
int a = 1, b = 2;
cout << "a = " << a << ", b = " << b << "\n";
swapints(&a, &b);
cout << "a = " << a << ", b = " << b << "\n";
a = 1, b = 1;
cout << "a = " << a << ", b = " << b << "\n";
swapints(&a, &b);
cout << "a = " << a << ", b = " << b << "\n";
a = 0, b = 1;
cout << "a = " << a << ", b = " << b << "\n";
swapints(&a, &b);
cout << "a = " << a << ", b = " << b << "\n";
return 0;
}
// 2_11b.c
// swap two integers
void swapints(int &a, int &b)
{
int t = a;
a = b;
b = t;
}
//: version 2
#include <stream.h>
#include "2_11b.c"
main()
{
int a = 1, b = 2;
cout << "a = " << a << ", b = " << b << "\n";
swapints(a, b);
cout << "a = " << a << ", b = " << b << "\n";
a = 1, b = 1;
cout << "a = " << a << ", b = " << b << "\n";
swapints(a, b);
cout << "a = " << a << ", b = " << b << "\n";
a = 0, b = 1;
cout << "a = " << a << ", b = " << b << "\n";
swapints(a, b);
cout << "a = " << a << ", b = " << b << "\n";
return 0;
}
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Answer to Question 2.11