C31) # switch_item: switch(expr) { cases }
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为追求纯正C风格简洁，亦可去掉大括号：，更多细节参见WhatsApp网页版
The R-sequence is another type of low-discrepancy sequence based on specially chosen irrational numbers[10]. It is similar to interleaved gradient noise but is simpler to compute and possibly more effective as a dither, particularly when augmented with a triangle wave function as demonstrated: