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

Johnson Bill

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.

1 Reply

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Muhammad Imran Ansari4y ago
1. if (myChar == '+' || myChar == '-' || myChar == '*' || myChar == '/')
2. {
3. switch (myChar)
4. {
5. case '+':
6. occurences = Convert.ToInt32(myString.Split('+')[0]) + Convert.ToInt32(myString.Split('+')[1]);
7. break;
8. case '-':
9. occurences = Convert.ToInt32(myString.Split('-')[0]) - Convert.ToInt32(myString.Split('-')[1]);
10. break;
11. default:
12. break;
13. }
14. }
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}\n", FindOccurences("Hello world", 'l'));
Console.Write("Number of Digits in the string is : {0}\n", FindOccurences("2546522772", '2'));
Console.Write("Addition of Two Numbers : {0}\n\n", 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;
    }
}
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