1首先标准只(zhī )是(shì )规定了这些函(hán )数的接口和(hé )具(jù )体(tǐ )的运(yùn )行效(xiào )率的(de )要(yào )求,这(zhè )些函数具(jù )体是怎么写(xiě )得要(yào )看各个(gè )编译(yì )器的实现(xiàn )和平台2例(lì )如(rú )使(shǐ )用(yòng )的编译(yì )器是(shì )visual studio,微软提(tí )供(gòng )了一部分C运行时CRT的源码,里面会有memcpy,strcpy之类的
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