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What is the simplest way to count the number of occurrences of a specific character in a string?
That is, I need to write a function, countTheCharacters(), so that
str = "the little red hen" count = countTheCharacters(str,"e") ' Count should equal 4 count = countTheCharacters(str,"t") ' Count should equal 3 
360
Let's start with a simple/naive approach: String someString = "elephant"; char someChar = 'e'; int count = 0; for (int i = 0; i < someString. length(); i++) { if (someString. charAt(i) == someChar) { count++; } } assertEquals(2, count);
First, we split the string by spaces in a. Then, take a variable count = 0 and in every true condition we increment the count by 1. Now run a loop at 0 to length of string and check if our string is equal to the word.
In Python, you can get the length of a string str (= number of characters) with the built-in function len() .
The most straightforward is to simply loop through the characters in the string:
Public Function CountCharacter(ByVal value As String, ByVal ch As Char) As Integer Dim cnt As Integer = 0 For Each c As Char In value If c = ch Then cnt += 1 End If Next Return cnt End Function Usage:
count = CountCharacter(str, "e"C) Another approach that is almost as effective and gives shorter code is to use LINQ extension methods:
Public Function CountCharacter(ByVal value As String, ByVal ch As Char) As Integer Return value.Count(Function(c As Char) c = ch) End Function If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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