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LISTING 20.5 POINTERS TO FUNCTIONS |
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1: // Listing 20.5 Using function pointers
2:
3: #include <iostream.h>
4:
5: void Square (int&, int&);
6: void Cube (int&, int&);
7: void Swap (int&, int &);
8: void GetVals(int&, int&);
9: void PrintVals(int, int);
10:
11: int main()
12: {
13: void (* pFunc) (int &, int &);
14: bool fQuit = false;
15:
16: int valOne=1, valTwo=2;
17: int choice;
18: while (fQuit == false)
19: {
20: cout << (0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: ;
21: cin >> choice;
22: switch (choice)
23: {
24: case 1: pFunc = GetVals; break;
25: case 2: pFunc = Square; break;
26: case 3: pFunc = Cube; break;
27: case 4: pFunc = Swap; break;
28: default : fQuit = true; break;
29: }
30:
31: if (fQuit)
32: break;
33:
34: PrintVals(valOne, valTwo);
35: pFunc(valOne, valTwo);
36: PrintVals(valOne, valTwo);
37: }
38: return 0;
39: }
40:
41: void PrintVals(int x, int y)
42: {
43: cout << x: << x << y: << y << endl;
44: }
45:
46: void Square (int & rX, int & rY) |
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continues |
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