How to check if last char of an array string ends with "A"

Question

I have made an array where the user inputs several names, I then want the program to print them out. If the letter ends with "a" I want it to change color. Here's what I mean in code.

        Array.Sort(stodents);

        Console.WriteLine("----------");

        for (int i = 0; i < stodents.Length; i++)
        {
            if (What do I type here?)
            {
                Console.ForegroundColor = ConsoleColor.Magenta;
            }
            else
            {
                Console.ForegroundColor = ConsoleColor.Blue;
            }
            Console.WriteLine(stodents[i]);
        }

So yeah I want it to make the string blue when it doesn't end with an A and magenta when it does.

have you checked EndsWith in string ? I think this can resolve your problem — Amit Verma, Aug 01 '21 at 02:13
the requirement says that last character of array. Then this will work. I think there may be some other issue in understanding question.. Can you share your sample array and output ? — Amit Verma, Aug 01 '21 at 02:19
Someone shared how to do it, I am very new to this and it's confusing. But thanks anyways! — Your Kyckling, Aug 01 '21 at 02:20

Anu Viswan · Accepted Answer · 2021-08-01T15:56:11.373

2

You could use the String.EndsWith method.

if(stodents[i].EndsWith('a'))

The method checks if the string ends with a specified char/string (depending on the overload you use) and returns true if it finds a match.

You could also use the overload with StringComparison enum if you want to make it case-insensitive check

For example,

if(stodents[i].EndsWith("a",StringComparison.CurrentCultureIgnoreCase))

edited Aug 01 '21 at 15:56

answered Aug 01 '21 at 02:14

Anu Viswan

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3

For strings entered by the user, `CurrentCultureIgnoreCase` would probably be more appropriate than `OrdinalIgnoreCase` as it respects the casing rules of the current culture. See e.g. https://stackoverflow.com/questions/3550213/in-c-sharp-what-is-the-difference-between-toupper-and-toupperinvariant – Klaus Gütter Aug 01 '21 at 05:20

paulsm4 · Answer 2 · 2021-08-01T02:23:23.130

Here's one example:

   Array.Sort(students);
    Console.WriteLine("----------");

    foreach (string student in students)
    {
        if (student.EndsWith('A')
        {
            Console.ForegroundColor = ConsoleColor.Magenta;
        }
        else
        {
            Console.ForegroundColor = ConsoleColor.Blue;
        }
        Console.WriteLine(student);
    }

NOTE:

In C#, common to use "foreach()" instead of a "for()" loop.
One solution is to use the .Net API StringEndsWith()
One problem is that your code most end with 'A'. You can "generalize" your code to accomodate either upper or lower case by using String.ToLower().

'Hope that helps.

PS: As Anu6is correctly pointed out (and as the documentation I cited shows), you can also use an optional StringComparison comparisonType argument for a case-insensitive comparison. The drawback is then you must use a string ("A") instead of a character ('A').

In regards to your point 3, EndsWith also accepts a StringComparison in which you can use StringComparison.OrdinalIgnoreCase — Anu6is, Aug 01 '21 at 02:22
For strings entered by the user, `CurrentCultureIgnoreCase` would probably be more appropriate than `OrdinalIgnoreCase` as it respects the casing rules of the current culture. See e.g. https://stackoverflow.com/questions/3550213/in-c-sharp-what-is-the-difference-between-toupper-and-toupperinvariant — Klaus Gütter, Aug 01 '21 at 05:20

How to check if last char of an array string ends with "A"

2 Answers2