递归如果使用递归(就是说,如果有一个直接或间接调用它本身的块)并且带参块包括OFDT,ONDTR或TMR,必须遵循额外的两条规则:a编制源块次序使其能在对本身递归调用之前调用带参块:不要编制直接调用带参块本身的程序。
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