[問題] array的定義放迴圈裡面或外面比較有效率?
問題:
考量程式的效率或其他層面,
array 或 vector 的定義放在迴圈裡面比較好還是外面比較好?
譬如: 我有一個array在每loop一次之前需要重新歸零,哪個做法比較好?
ps. 我不是資工相關背景
for(int n=0; n < N; n++)
{
double array[500]={0.0};
...
...
...
}
double array[500]
for(int n=0; n < N; n++)
{
memset(array, 0.0, 500*sizeof(double)); // 歸零
...
...
...
}
--
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※ 編輯: eagle32 (140.109.103.203), 12/17/2014 11:36:21
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