Converting a ASCII value into its corresponding Integer value

Question

The objective of this code is to add all the integers in a whole number into one value (e.g "2013" => 6), In c# I have written the code so it outputs the number to its corresponding ASCII value one at a time, but I am at a loss at how to convert it back into its number value.

Note that I am new at C#

        string Year;
        int Total = 0;
        int Adding = 0;
        int Adding2 = 0;

        Console.WriteLine("Write The year you want converted");
        Year = Console.ReadLine();

        for (int i = 0; i < Year.Length; i++)
        {
            Adding2 = Year[i];
            Adding = Convert.ToInt32(Adding2);
            Total = Adding + Total;
            
            Console.WriteLine(Total);
        }

Dmitrii Bychenko · Accepted Answer · 2022-10-19 14:30:15Z

3

You should sum values, not ascii codes:

    ...

    for (int i = 0; i < Year.Length; i++)
    {
        Adding2 = Year[i];
        Adding = Adding2 - '0';
        Total = Adding + Total;
    }

    Console.WriteLine(Total);

In general case, you can use char.GetNumericValue():

    // double: some characters have fractional values: '⅝'
    double Total = 0.0;

    foreach (char c in Year) {
      double value = char.GetNumericValue(c);

      // If character has value (e.g. 'A' doesn't have) 
      if (value != -1)
        Total += value;
    } 

    Console.WriteLine(Total);

edited Oct 19, 2022 at 14:30

answered Oct 19, 2022 at 14:21

Dmitrii Bychenko

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1 Comment

Jeroen Mostert Over a year ago

Note that both approaches would need explicit input validation for the cases of non-digits in a real application, as they otherwise give nonsensical results without complaining.

Shankar S · Accepted Answer · 2025-02-17 05:38:22Z

0

Just little tweak to your code, will get the result

string Year;
int Total = 0;

Console.WriteLine("Write The year you want converted");
Year = Console.ReadLine();

for (int i = 0; i < Year.Length; i++)
{
    //  IN ASCII 
    //  48 means => number 0
    //  49 => 1
    //  .
    //  .
    //  58 => 10
    // So you need to subtract 48 from ascii value to get actual number
    Total = (Year[i] - 48) + Total;
}
Console.WriteLine(Total);

answered Feb 17 at 5:38

Shankar S

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