I just love people who make the effort and help to teach others new stuff. But with code samples i don't understand why you don't test the code before publishing. I found an interesting example off callback function example but it was not working. Here is the proper stuff:) #include <stdio.h> #include <stdlib.h> typedef struct { int age ; char name [ 10 ] ; char surname [ 10 ] ; } person ; // Simple fuction to be called as callback void callMe ( person * m ) { printf ( "%d %s %s \n \r " , m -> age , m -> name , m -> surname ) ; } int main ( int argc , char * argv [ ] ) { // Declaration of pointer to function with same signiture as callMe void ( * callback ) ( person * ) ; // Create struct and fill with data person s ; s. age = 27 ; //Don't forget how to copy strings in C/C++ ...