#include <stdio.h> void ffff(int ee) { printf("apple: %i\n",ee); } typedef struct { int ppp; void (*eee)(int); }qqq; int main() { qqq eple; eple.ppp = 9; eple.eee = &ffff; (*eple.eee)(eple.ppp); void (*tt)(int); // Return type, *name , arguments. tt = &ffff; // "Address off" is optinal. (implicitly casted) (*tt)(5); // Dereference pointer is optinal. Look below. (&ffff)(7); // Address to a fuction is vaild. (&printf)("valid function call\n"); return 0; }