// Listing 15.5 Using function pointers
#include <iostream>
using namespace std;
void Square (int&,int&);
void Cube (int&, int&);
void Swap (int&, int &);
void GetVals(int&, int&);
void PrintVals(int, int);
int main()
{
void (* pFunc) (int &, int &);
bool fQuit = false;
int valOne=1, valTwo=2;
int choice;
while (fQuit == false)
{
cout << "(0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: ";
cin >> choice;
switch (choice)
{
case 1: pFunc = GetVals; break;
case 2: pFunc = Square; break;
case 3: pFunc = Cube; break;
case 4: pFunc = Swap; break;
default : fQuit = true; break;
}
if (fQuit)
break;
PrintVals(valOne, valTwo);
pFunc(valOne, valTwo);
PrintVals(valOne, valTwo);
}
return 0;
}
void PrintVals(int x, int y)
{
cout << "x: " << x << " y: " << y << endl;
}
void Square (int & rX, int & rY)
{
rX *= rX;
rY *= rY;
}
void Cube (int & rX, int & rY)
{
int tmp;
tmp = rX;
rX *= rX;
rX = rX * tmp;
tmp = rY;
rY *= rY;
rY = rY * tmp;
}
void Swap(int & rX, int & rY)
{
int temp;
temp = rX;
rX = rY;
rY = temp;
}
void GetVals (int & rValOne, int & rValTwo)
{
cout << "New value for ValOne: ";
cin >> rValOne;
cout << "New value for ValTwo: ";
cin >> rValTwo;
}
(0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: 1
x: 1 y: 2
New value for ValOne: 2
New value for ValTwo: 3
x: 2 y: 3
(0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: 3
x: 2 y: 3
x: 8 y: 27
(0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: 2
x: 8 y: 27
x: 64 y: 729
(0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: 4
x: 64 y: 729
x: 729 y: 64
(0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: 0
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