[참고]조금 난해한 포인터 예제

하다보니 조금 난해해 졌군요.

공부하시는데 조금이나마 도움이 되었으면 좋겠군요 ^^;

void *song[2];

int s1(int a, int b, int c);
int s2(int a, int b);

void main(void)
{
int a, b, c, d;
int (*ps1) (int, int, int);
int (*ps2) (int, int);

ps1 = s1;
ps2 = s2;

song[0] = (void *)ps1;
song[1] = (void *)ps2;

a = (*(int (*) (int, int, int)) song[0]) (1, 2, 3);
b = (*(int (*) (int, int)) song[1]) (1, 2);

c = ((int (*) (int, int, int)) song[0]) (1, 2, 3);
d = ((int (*) (int, int)) song[1]) (1, 2);

printf(" a %d \n", ps1(1, 2, 3));
printf(" b %d \n", ps2(1, 2));

printf(" real a %d \n", a);
printf(" real b %d \n", b);

printf(" c %d \n", c);
printf(" d %d \n", d);
}

int s1(int a, int b, int c)
{
return(a*b*c);
}

int s2(int a, int b)
{
return(a*b);
}