IC697CMM712循環(huán)中的大常數(shù)技術(shù)
如果在循環(huán)內(nèi)部放置一個常數(shù)，會使循環(huán)的每次執(zhí)行都拷貝這個數(shù)據(jù)，從而加大執(zhí)行時間和存儲器使用率。工程師可以避免這個情況，做法是把該常數(shù)移出該循環(huán)，或者用本地變量把數(shù)據(jù)傳遞到循環(huán)中。
數(shù)據(jù)類型強制轉(zhuǎn)換技術(shù)IC697CMM712
LabView 開發(fā)環(huán)境只要有可能就自動地處理數(shù)據(jù)類型的沖突，其做法是把較小的數(shù)據(jù)類型轉(zhuǎn)換成較大的數(shù)據(jù)類型。例如，如果在一個整數(shù)和一個浮點數(shù)之間發(fā)生一個類型沖突，那么LabView就把該整數(shù)轉(zhuǎn)換成一個浮點數(shù)，隨后再執(zhí)行運算操作。這個轉(zhuǎn)換的代價是昂貴的，而且在許多情況下是不必要的。在大多數(shù)情況下，工程師可以通過為每個變量選取正確的數(shù)據(jù)類型來避免強制轉(zhuǎn)換。但是，如果該數(shù)據(jù)必須被強制轉(zhuǎn)換，則應(yīng)在將其送去進行操作運算或函數(shù)計算前就完成轉(zhuǎn)換，這樣效率將會更高些。
IC697CMM712
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IC697CMM712
