โปรแกรม C# นับจำนวนครั้งที่ตัวอักษรปรากฏในสตริง

กำหนดสตริง:

String s = "mynameistomhanks";

สร้างอาร์เรย์นับและเมธอดคำนวณ:

static void calculate(String s, int[] cal) {
    for (int i = 0; i < s.Length; i++)
        cal[s[i]]++;
}

ตัวอย่าง

using System;
class Demo {
    static int maxCHARS = 256;
    static void calculate(String s, int[] cal) {
        for (int i = 0; i < s.Length; i++)
            cal[s[i]]++;
    }
    public static void Main() {
        String s = "mynameistomhanks";
        int[] cal = new int[maxCHARS];
        calculate(s, cal);
        for (int i = 0; i < maxCHARS; i++) {
            if (cal[i] > 1) {
                Console.WriteLine("Character " + (char)i);
                Console.WriteLine("Occurrence = " + cal[i] + " times");
            }
            if (cal[i] == 1) {
                Console.WriteLine("Character " + (char)i);
                Console.WriteLine("Occurrence = " + cal[i] + " time");
            }
        }
    }
}

ผลลัพธ์

Character a Occurrence = 2 times
Character e Occurrence = 1 time
Character h Occurrence = 1 time
Character i Occurrence = 1 time
Character k Occurrence = 1 time
Character m Occurrence = 3 times
Character n Occurrence = 2 times
Character o Occurrence = 1 time
Character s Occurrence = 2 times
Character t Occurrence = 1 time
Character y Occurrence = 1 time