#include<stdio.h>
#include<conio.h>
#define MAX 100

void NhapMang(int a[], int n)
{
	for (int i = 0; i < n; i++)
	{
		printf("\nNhap vao phan tu a[%d] = ", i);
		scanf_s("%d", &a[i]);
	}
}
void XuatMang(int a[], int n)
{
	for (int i = 0; i < n; i++)
	{
		printf("%4d", a[i]);
	}
}

int KiemTraDoiXung(int a[], int n)
{
	for (int i = 0; i < n / 2; i++)
	{
		if (a[i] != a[n - 1 - i])
		{
			return 0; // Sai
		}
	}
	return 1; // Đúng
}
int main()
{
	int n;
	do
	{
		printf("\nNhap vao so luong phan tu cua mang: ");
		scanf_s("%d", &n);
		if (n < 0 || n > MAX)
		{
			printf("\nSo luong phan tu khong hop le. Xin kiem tra lai !");
		}
	} while (n < 0 || n > MAX);

	int a[MAX];
	NhapMang(a, n);
	XuatMang(a, n);

	int Check = KiemTraDoiXung(a, n);
	if (Check == 1)
	{
		printf("\nMang doi xung");
	}
	else
	{
		printf("\nMang khong doi xung");
	}

	_getch();
	return 0;
}

Line 17: error: conio.h: No such file or directory
In function 'NhapMang':
Line 7: error: 'for' loop initial declaration used outside C99 mode
In function 'XuatMang':
Line 15: error: 'for' loop initial declaration used outside C99 mode
In function 'KiemTraDoiXung':
Line 23: error: 'for' loop initial declaration used outside C99 mode