#include<stdio.h>
#include<conio.h>
#include<math.h>
#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 KiemTraDang2K(int n)
{
	if (n <= 1)
      return 1;
	while(n > 1)  // vòng lặp kết thúc khi n == 1
    {
        if(n % 2 != 0)   
            return 0;
        n /= 2;
    }
    return 1;
}

int TimGiaTri2KDauTien(int a[], int n)
{
	for(int i = 0; i < n; i++)
	{
		if(KiemTraDang2K(a[i]) == 1)
		{
			return a[i];
		}
	}
	return 0;
}
int main()
{
	int n;
	int a[MAX];

	nhap(a, n);
	xuat(a, n);
	
	int KetQua = TimGiaTri2KDauTien(a, n);
	printf("\nGia tri 2k dau tien la %d", KetQua);
	 
	getch();
	return 0;
}

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 'TimGiaTri2KDauTien':
Line 47: error: 'for' loop initial declaration used outside C99 mode