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#include <stdio.h>
struct base {
int foo;
};
struct derived {
int foo;
char *bar;
};
void foobar(void *ptr)
{
((struct base *) ptr)->foo = 100;
}
int main(int argc, char **argv)
{
struct derived d = {1, "derived"};
printf("before: %d\n", d.foo);
foobar(&d);
printf("after: %d\n", d.foo);
return 0;
}
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