include "cowgol.coh";

sub fibonacci(n: uint32): (a: uint32) is
    a := 0;
    var b: uint32 := 1;
    while n > 0 loop
        var c := a + b;
        a := b;
        b := c;
        n := n - 1;
    end loop;
end sub;

# test
var i: uint32 := 0;
while i < 20 loop
    print_i32(fibonacci(i));
    print_char(' ');
    i := i + 1;
end loop;
print_nl();