void DuyetCacPhanTuTamGiacTrenDuongCheoPhu(int a[][MAX], int n)
{
	for(int i = 0; i < n - 1; i++)
	{
		for(int j = 0; j < n - 1 - i; j++)
		{
			printf("%4d",a[i][j]);
		}
	}
	
}

Line 1: error: 'MAX' undeclared here (not in a function)
In function 'DuyetCacPhanTuTamGiacTrenDuongCheoPhu':
Line 3: error: 'for' loop initial declaration used outside C99 mode
Line 5: error: 'for' loop initial declaration used outside C99 mode