```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 ``` ```#include #include #include #define MAX 100 void nhap (int a[], int &n) { do { printf("\nNhap so phan tu: "); scanf("%d", &n); if(n <= 0 || n > MAX) { printf("\nSo phan tu khong hop le. Xin kiem tra lai !"); } }while(n <= 0 || n > MAX); for(int i = 0; i < n; i++) { printf("\nNhap a[%d]: ", i); scanf("%d", &a[i]); } } void xuat(int a[], int n) { for(int i = 0; i < n; i++) { printf("%4d", a[i]); } } int KiemTraDang3K(int n) { int flag=1; n = n < 0 ? -n : n; if(n < 2) return 1; while(n > 1) { int du = n % 3; if(du != 0) // nếu dư mà khác 0. lập tức báo sai flag = 0; n /= 3; } if(flag == 1) return 1; else return 0; } void LietKeCacGiaTriCoDang3K(int a[], int n) { for(int i = 0; i < n; i++) { if(KiemTraDang3K(a[i]) == 1) { printf("%4d", a[i]); } } } int main() { int n; int a[MAX]; nhap(a, n); xuat(a, n); printf("\nCac gia tri co dang 3^k trong mang la: "); LietKeCacGiaTriCoDang3K(a, n); getch(); return 0; } ```
 ```1 2 3 4 5 6 ``` ```Line 17: error: conio.h: No such file or directory Line 6: error: expected ';', ',' or ')' before '&' token In function 'xuat': Line 26: error: 'for' loop initial declaration used outside C99 mode In function 'LietKeCacGiaTriCoDang3K': Line 54: error: 'for' loop initial declaration used outside C99 mode ```