题解 | #计算某字符出现次数#

using System;
class Program {
    public static void Main() {
        string strInput = Console.ReadLine().ToLower();
        char str = Console.ReadLine().ToLower()[0];
        int count = 0;
        foreach (var s in strInput) {
            if (s == str) {
                count ++;
            }
        }
        Console.WriteLine(count);
    }
}