C, pasted on Sep 16:
 ```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 75 76 77 78 79 ``` ```#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]); } } // nguyên tố => true bool KiemTraNguyenTo(int n) { if (n < 2) { return false; } else if (n > 2) { if (n % 2 == 0) { return false; } for (int i = 3; i <= sqrt((float)n); i += 2) { if (n % i == 0) { return false; } } } return true; } int TimSoNguyenToCuoi(int a[], int n) { for(int i = n - 1; i >= 0; i--) { if(KiemTraNguyenTo(a[i]) == true) { return a[i]; } } return -1; } int main() { int n; int a[MAX]; nhap(a, n); xuat(a, n); int nguyentocuoi = TimSoNguyenToCuoi(a, n); printf("\nSo nguyen to cuoi cung la %d", nguyentocuoi); getch(); return 0; } ```

Output:
 ```1 2 3 4 5 6 7 8 9 10 11 ``` ```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 t.c: At top level: Line 32: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'KiemTraNguyenTo' In function 'TimSoNguyenToCuoi': Line 57: error: 'for' loop initial declaration used outside C99 mode Line 59: error: 'true' undeclared (first use in this function) Line 59: error: (Each undeclared identifier is reported only once Line 59: error: for each function it appears in.) ```

#include<iostream>
#define MAX 100
using namespace std;

void nhapMang(int* arr, int& n) {
do
{
cout << "Moi nhap so phan tu cua mang: ";
cin >> n;
if (0 >= n || n > 100) {
cout << "So phan tu trong mang khong hop le:" << endl;
}
} while (0 >= n || n > 100);
for (int i = 0; i < n; i++)
{
cout << "Moi nhap phan tu thu " << i << " trong mang: ";
cin >> arr[i];
}
}

void xuatMang(int* arr, int n) {
cout << "Mang vua nhap la: " << endl;
for (size_t i = 0; i < n; i++)
{
cout << arr[i] << " ";
}
cout << endl;
}

bool checkNguyenTo(int a) {
if (a < 2) {
return false;
}
else if (a > 2) {
if (a % 2 == 0) {
return false;
}
for (int i = 3; i < a; i += 2)
{
if (a % i == 0) {
return false;
}

}
}
return true;
}
int timNguyenTo(int* arr, int n) {
//int nguyenTo = -1;
for (int i = n-1; i >= 0; i--)
{
if (checkNguyenTo(arr[i]) == true) {
return arr[i];
}
}
return -1;
}

int main() {
int numOfArr;
int* Arr = new int[MAX];
nhapMang(Arr, numOfArr);
xuatMang(Arr, numOfArr);
cout << "So nguyen to cuoi cung cua mang la: " << timNguyenTo(Arr, numOfArr);
cout << endl;
system("pause");
return 0;
}