시험 등급

Console.WriteLine("시험점수느 0보다 크거나 같고, 100보다 작거나 같은 정수이다.");             for (; ; )             {                 Console.WriteLine("시험 점수를 입력하세요.");                 int input = int.Parse(Console.ReadLine());                 Console.Clear();                 Console.WriteLine(input);                 if (100 >= input && input >= 90)                 {                     Console.Clear();                     Console.WriteLine("A");                 }                 else if (89 >= input && input >= 80)                 {                     Console.Clear();                     Console.WriteLine("B");                 }                 else if (79 >= input && input >= 70)                 {                     Console.Clear();                     Console.WriteLine("C");                 }                 else if (69 >= input && input >= 60)                 {                     Console.Clear();                     Console.WriteLine("D");                 }                 else                 {                     Console.Clear();                     Console.WriteLine("F");                 }             } Colored by Color Scripter