C, pasted on Oct 4:
 ```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 ``` ```#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 TimChuSoDauLe( int n) { int dv; while (n >= 10) // vòng lặp kết thúc khi n < 10 { dv = n % 10; n = n / 10; } if (n % 2 == 0) return 0; return 1; } int LietKeViTriChuSoDauLe(int a[], int n) { for(int i = 0; i < n; i++) { if (TimChuSoDauLe(a[i]) == 1) { printf("%4d", a[i]); } } return 0; } int main() { int n; int a[MAX]; nhap(a, n); xuat(a, n); printf("\nCac so co chu so dau le la: "); LietKeViTriChuSoDauLe(a, n); getch(); return 0; } ```

Output:
 ```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 'LietKeViTriChuSoDauLe': Line 47: error: 'for' loop initial declaration used outside C99 mode ```

thuật toán của anh hay quá anh ơi ^_^

#include<iostream>
using namespace std;
bool check_cs_dau(int n){
while(n>9) n/=10;
if(n%2!=0) return true;
return false;
}
main(){
int n;
cout<<"So phan tu cua mang: ";
cin>>n;
int a[n];
for(int i=0; i<n; i++){
cout<<"a["<<i<<"]= ";
cin>>a[i];
}
for(int i=0; i<n; i++){
if(check_cs_dau(a[i])) cout<<a[i]<<" ";
}
cout<<endl;
}