#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]);
	}
}

void HoanVi(int &a, int &b)
{
	int temp = a;
	a = b;
	b = temp;
}
void SapXepTangDan(int a[], int n)
{
	for(int i = 0; i < n - 1; i++)
	{
		for(int j = i + 1; j < n; j++)
		{
			if(a[i] > a[j])
			{
				HoanVi(a[i], a[j]);
			}
		}
	}
}
int main()
{
	int n;
	int a[MAX];

	nhap(a, n);
	xuat(a, n);
	
	SapXepTangDan(a, n);
	printf("\nMang sau khi sap xep tang: ");
	xuat(a, n);

	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
t.c: At top level:
Line 32: error: expected ';', ',' or ')' before '&' token
In function 'SapXepTangDan':
Line 40: error: 'for' loop initial declaration used outside C99 mode
Line 42: error: 'for' loop initial declaration used outside C99 mode