#include <stdio.h>

typedef struct {
	int fn1, fn;
} Fib;

#define FibCtor { 1, 0 }

int fib( Fib * f ) {
	int fn = f->fn; f->fn = f->fn1;
		f->fn1 = f->fn + fn;
	return fn;
}
int main() {
	Fib f1 = FibCtor, f2 = FibCtor;
	for ( int i = 0; i < 10; i += 1 ) {
		printf( "%d %d\n", fib( &f1 ), fib( &f2 ) );
	}
}

// Local Variables: //
// tab-width: 4 //
// compile-command: "gcc Fib.c" //
// End: //