如何将其变成for循环？

Question

Hey im wondering how to turn this into a for loop, so I don't have to copy this 26 times for each letter of the alphabet:

count[1] = str.Split('A').Length - 1;
Console.WriteLine("A comes up x " + count[1]);

count is a blank integer array that takes 26 values, that represent the amount of times a letter of the alphabet is in string str, stored in a string array called letters

Answer 1

Instead of splitting and creating a new array, I would use the Count() function. You can then loop through each character, or loop your existing array.

for (char c = 'A'; c <= 'Z'; c++)
{
    Console.WriteLine(c + " comes up x " + str.Count(x => char.ToUpper(x) == c));
}

Answer 2

here's one:

static void Main(string[] args)
{
    var letters = "abcdefghijklmnopqrstuvwxyz";
    var str = "the quick brown fox jumps over the lazy dog";

    for (int i = 0; i < letters.Length; i++)
        Console.WriteLine("{0} comes up {1} time(s)", letters[i], str.ToLower().Split(letters[i]).Length - 1);

    Console.Read();

}

Answer 3

You can use array to store the count for each character. Split will be an expensive operation

var str = "THISISJUSTATEST";
var array = new int[26];
foreach(var character in str.ToCharArray()){
if (character >= 'A' && character <= 'Z'){
  var index = character - 'A';
  array[index]++;
  }
}
for (int i = 0; i < 26; i++) {
  var c = i +'A';
  Console.WriteLine("{0} comes {1} time(s)", (char)c, array[i]);
}