public static int[] Grade(int num)
int[] arr = new int[num];
for(int i=0;i<arr.Length;i++)
Console.WriteLine("the grade of student number{0}",i);
arr[i] = int.Parse(Console.ReadLine());
for(int i=0;i<arr.Length;i++)
public static void Main()
Console.WriteLine("the count of students");
int num = int.Parse(Console.ReadLine());
int[] grade = Grade(num);
for(int i=0;i<grade.Length;i++)
Console.WriteLine(grade[i]);