[問題] qsort

看板C_and_CPP (C/C++)作者icher168 (噗)時間16年前 (2009/08/23 16:54)推噓1(1推 0噓 1→)

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我要用內建的qsort來排陣列但我最主要不是要排完的陣列而是要它排後的index 以下此段程式在VC6可以跑 static int compare(const void* a, const void* b) /* Helper function for sort. Previously, this was a nested function under * sort, which is not allowed under ANSI C. */ { const int i1 = *(const int*)a; const int i2 = *(const int*)b; const double term1 = sortdata[i1]; const double term2 = sortdata[i2]; if (term1 < term2) return -1; if (term1 > term2) return +1; return 0; } void CALL sort(int n, const double data[], int index[]) /* Sets up an index table given the data, such that data[index[]] is in * increasing order. Sorting is done on the indices; the array data * is unchanged. */ { int i; sortdata = data; for (i = 0; i < n; i++) index[i] = i; qsort(index, n, sizeof(int), compare); } 但在VC.NET需要改寫在我亂改一通後變成 int Cemd1Dlg::compare(const void* a, const void* b) { const int i1 = *(const int*)a; const int i2 = *(const int*)b; int term1 = sortdata[i1];//問題 int term2 = sortdata[i2];//問題 if (term1 < term2) return -1; if (term1 > term2) return +1; return 0; } void Cemd1Dlg::CALL_sort(int n,int* data , int index[]) { int i; sortdata=new int [n]; for (i = 0; i < n; i++) { sortdata[i] = data[i]; index[i] = i; } qsort(index, n, sizeof(int), compare); delete [] sortdata; } 但仍然有問題， error C2597: 參考非靜態成員'Cemd1Dlg::sortdata' 是不合法的 error C2109: 註標必須使用在陣列或指標型別上不知道有沒有大大，可以給我一些指教呢? 謝謝^^~跪~ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.129.77.9