Flowcharts are Turing-complete [0] so, theoretically, can represent any valid computer program. Programming is about a whole bunch of things but, as regards the actual coding bit, flowcharts can do 100%.
[0] Admittedly, I haven't explored the original article enough to determine whether this one is, but that's not really my point.
[0] Admittedly, I haven't explored the original article enough to determine whether this one is, but that's not really my point.