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在c語言上使用乘除法有什麼要注意的嗎?
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資深會員
 
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我使用一顆18f458
由於上面只有8乘8的硬體乘法器 我大概宣告變去做了一下加減乘除,再看watch指令執行數 各計算週期數約如下,可能不太精確求其大概而以: 加 減 除 乘 unsigned int 20 20 240 50 long 37 41 743 100 float 130 150 405 140 本來另有宣告double,但sizeof(double)=4 好像和float相同 不知道是不能宣告double的浮點數嗎? 又這樣的執行週期可正常? c18有提供特殊指令來做乘除嗎?
發表於: 2006/8/7 14:17
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