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#include <stdlib.h>
/* // ... */
char *p = malloc(10);

func(1, 2);
/* // ... */
int func(int one, int two, int three){
  printf("%d %d %d", one, two, three);
  return 1;
}

int func(int, int, int);
/* // ... */

func(1, 2, 3);
/* // ... */
int func(int one, int two, int three){
  printf("%d %d %d", one, two, three);
  return 1;
}

int add(int x, int y, int z) {
   return x + y + z;
}

int main(int argc, char *argv[]) {
   int (*fn_ptr) (int, int);
   int res;
   fn_ptr = add;
   res = fn_ptr(2, 3);  /* incorrect */
   /* // ... */
   return 0;
}

int add(int x, int y, int z) {
   return x + y + z;
}

int main(int argc, char *argv[]) {
   int (*fn_ptr) (int, int, int) ;
   int res;
   fn_ptr = add;
   res = fn_ptr(2, 3, 4);
   /* // ... */
   return 0;
}