#include <stdio.h>
#include <string.h>

struct my_st {
        char name[10];
        int  num;
};

void print_struct (struct my_st data)
{
        printf("{ name = %s; num = %d }\n", data.name, data.num);
}

void cbv_mutate(struct my_st data)
{
        data.name[0] = 'b';
        data.num = -1;
}

void cbr_mutate(struct my_st *data)
{
        data->name[0] = 'b';
        data->num = -1;
}

int main(int argc, char **argv)
{
        struct my_st s, t;
        struct {
                char *name;
                int  num;
        } u;

        strcpy(s.name, "foo");
        s.num  = 4;

        t = s;
        /* u = s;  this produces an incompatible type error at compile time */
        /*         as does an attempt to pass u to print_struct().  So      */
        /*         char[10] and (char *) are not the same!                  */
        u.name = s.name;
        u.num  = s.num;

        print_struct(s);
        cbv_mutate(s);
        print_struct(s);
        cbr_mutate(&s);
        print_struct(s);
        print_struct(t);
        /* print_struct(u); compilation error.  see above */
        printf("{ name = %s; num = %d }\n", u.name, u.num);

        return 0;
}