在使用MUL和DIV功能時(shí)應(yīng)小心注意避免溢出。如果你不得已把INT值轉(zhuǎn)換至DINT值,記住CPU使用帶有正負(fù)號(hào)的標(biāo)準(zhǔn)2’S補(bǔ)碼,其延伸至第2個(gè)字的最高位。必須檢驗(yàn)低16位字的正負(fù)號(hào),并將它延伸至第2個(gè)16位字。如果在一16位INT字中最有效的位為0(正)
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