문제

https://www.acmicpc.net/problem/9498

C# 풀이

using System;

namespace baekjoon
{
    class Program
    {
        static void Main(string[] args)
        {
            string strScore = Console.ReadLine();
            int nScore = int.Parse(strScore);

            if (90 <= nScore && nScore <= 100)
            {
                Console.WriteLine("A");
            }
            else if (80 <= nScore && nScore <= 89)
            {
                Console.WriteLine("B");
            }
            else if (70 <= nScore && nScore <= 79)
            {
                Console.WriteLine("C");
            }
            else if (60 <= nScore && nScore <= 69)
            {
                Console.WriteLine("D");
            }
            else if (nScore <= 59)
            {
                Console.WriteLine("F");
            }
        }
    }
}