| ??? 11/08/07 16:35 Read: times |
#146785 - Parameter passing in C Responding to: ???'s previous message |
The 'C' language passes parameters by value; that is, parameters are effectively input-only to the function.
Therefore, if you want a function to be able to modify something by passing a parameter, you have to pass a pointer to the thing you want to modify. (C++ provides reference parameters) If the thing you want to modify is itself a pointer, you will naturally end up with a pointer to a pointer! In theory, you can keep doing this indefinitely; In practice, a real compiler will impose some limit on the maximum number of levels of indirection; eg, for Keil C51, it's 19: http://www.keil.com/support/m...c51_xd.htm |
| Topic | Author | Date |
| C : pointers of function und pointers of pointers | 01/01/70 00:00 | |
| Function pointers and stuff | 01/01/70 00:00 | |
| Parameter passing in C | 01/01/70 00:00 | |
| C FAQ | 01/01/70 00:00 | |
| Function pointer demo | 01/01/70 00:00 | |
| Heads up | 01/01/70 00:00 | |
| True | 01/01/70 00:00 | |
| I use function pointers all the time | 01/01/70 00:00 | |
| void-void function pointers need not be slow | 01/01/70 00:00 | |
| correct, with a caveat | 01/01/70 00:00 | |
thank you all. | 01/01/70 00:00 |