I'd like to write reusable oop code in C#.NET which does the following

Question

I need to write reusable oop code in C#.NET which does the following (just one solution):
1. counts occurences of a specific letter in a string. e.g 'l' in "Hello world" => 3
2. counts occurences of a specific digit in a number e.g. 2 in 2546522772 => 4
3. Adds two numbers together. e.g 2+5 => 7

Which is the best way to approach this? Thanks.

Muhammad Imran Ansari · Answer

if (myChar == '+' || myChar == '-' || myChar == '*' || myChar == '/' ) { switch (myChar) { case '+' : occurences = Convert.ToInt32(myString.Split( '+' )[0]) + Convert.ToInt32(myString.Split( '+' )[1]); break ; case '-' : occurences = Convert.ToInt32(myString.Split( '-' )[0]) - Convert.ToInt32(myString.Split( '-' )[1]); break ; default : break ; } } If you need to perform only addition then you can use the following code: public static int FindOccurences( string myString, char myChar) { int occurences = 0; if (myChar == '+' ) { occurences = Convert.ToInt32(myString.Split( '+' )[0]) + Convert.ToInt32(myString.Split( '+' )[1]); } else occurences = myString.Count(s => s == myChar); return occurences; } static void Main(string[] args) { Console.Write( "Number of Alphabets in the string is : {0}
" , FindOccurences( "Hello world" , 'l' )); Console.Write( "Number of Digits in the string is : {0}
" , FindOccurences( "2546522772" , '2' )); Console.Write( "Addition of Two Numbers : {0}

" , FindOccurences( "2+5" , '+' )); } For Multiple operators you can use switch statement like in If block: if (myChar == '+' || myChar == '-' || myChar == '*' || myChar == '/' ) { switch (myChar) { case '+' : occurences = Convert.ToInt32(myString.Split( '+' )[0]) + Convert.ToInt32(myString.Split( '+' )[1]); break ; case '-' : occurences = Convert.ToInt32(myString.Split( '-' )[0]) - Convert.ToInt32(myString.Split( '-' )[1]); break ; default : break ; } }