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LISTING 20.7 PASSING POINTERS TO FUNCTIONS AS FUNCTION ARGUMENTS |
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1: // Listing 20.7 Without 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(void (*)(int&, int&), int&, int&);
10:
11: int main()
12: {
13: int valOne=1, valTwo=2;
14: int choice;
15: bool fQuit = false;
16:
17: void (*pFunc)(int&, int&);
18:
19: while (fQuit == false)
20: {
21: cout << (0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: ;
22: cin >> choice;
23: switch (choice)
24: {
25: case 1:pFunc = GetVals; break;
26: case 2:pFunc = Square; break;
27: case 3:pFunc = Cube; break;
28: case 4:pFunc = Swap; break;
29: default:fQuit = true; break;
30: }
31: if (fQuit == true)
32: break;
33: PrintVals ( pFunc, valOne, valTwo);
34: }
35:
36: return 0;
37: }
38:
39: void PrintVals( void (*pFunc)(int&, int&), int& x, int& y)
40: {
41: cout << x: << x << y: << y << endl;
42: pFunc(x,y);
43: cout << x: << x << y: << y << endl;
44: }
45:
46: void Square (int & rX, int & rY)
47: {
48: rX *= rX; |
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continues |
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