public void Test_Grade()
{
Assert.Equal('A', Program5.Grade(91));
Assert.Equal('B', Program5.Grade(81));
Assert.Equal('C', Program5.Grade(71));
Assert.Equal('D', Program5.Grade(61));
Assert.Equal('E', Program5.Grade(51));
}
public static void Main(string[] args) =>
// write to console
// Program1.MainAsync(args).GetAwaiter().GetResult();
// write with date
// Program2.MainAsync(args).GetAwaiter().GetResult();
// count headline
// Program3.MainAsync(args).GetAwaiter().GetResult();
// filtering
// Program4.MainAsync(new string[] { "Info" }).GetAwaiter().GetResult();
// interactive
Program5.MainAsync(args).GetAwaiter().GetResult();
