// funcPtr.c
//
// Copyright 2009 Kim Sung-tae <pchero@MyNote>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301, USA.#include <stdio.h>
#define FUNC1 func1
#define FUNC2 func2int func1(int intVal1) { return –intVal1; }
int func2(int intVal2) { return –intVal2; }int runFunc(char* string, int inVal)
{
int retVal;
int (*funcPtr)(int retVal);
funcPtr = string;
return (*funcPtr)(inVal);
}int main(int argc, char** argv)
{
int intVal = 3;
intVal = runFunc(FUNC2, intVal);
printf(“After running func2 intVal : %dn”, intVal);
intVal = runFunc(FUNC1, intVal);
printf(“After running func1 intVal : %dn”, intVal);
return 0;
}
함수 이름을 포인터에 할당하여 사용하는 재미있는 프로그램.
함수들을 필요한 순서대로 만들어 둔 뒤, 포인터를 이용하여 상황에 따라 적절한 함수가 호출되도록 만든다면 상태머신(State machine)프로그램 등 유용하게 사용할 수 있을 것이다.
Tags: C/C++, Unix Programming
