C#•2y ago

❔ Convert decimal without trailing 0s

My goal is to print decimal numbers with all available precision and without a trailing .0

decimal a = 123.0m;
decimal b = 123m;
Console.WriteLine(a.ToString()); // 123.0
Console.WriteLine(b.ToString()); // 123
Console.WriteLine(a.ToString() == b.ToString()); // false

decimal a = 123.0m;
decimal b = 123m;
Console.WriteLine(a.ToString()); // 123.0
Console.WriteLine(b.ToString()); // 123
Console.WriteLine(a.ToString() == b.ToString()); // false

I'd like 123.0 to convert to 123 not 123.0. How can I do this for the decimal type? I was somewhat surprised that 123.0 and 123 are converted into different values.

17 Replies

MODiX•2y ago

Samarichitane#3472

REPL Result: Success

123.0m == 123m

123.0m == 123m

Result: bool

True

True

Compile: 365.481ms | Execution: 23.164ms | React with ❌ to remove this embed.

Servator•2y ago

Both are decimal

n8ta•2y ago

Not the numeric value the value returned by .ToString()

Servator•2y ago

Why you are comparing values with .ToString() Just use == or .Equals()

n8ta•2y ago

My goal is to print decimal numbers with all available precision and without a trailing .0

Servator•2y ago

That's a better explanation

n8ta•2y ago

I'm not actually comparing them that's just to show they are diff. I'll edit the Q.

jalepi•2y ago

https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-strings

Standard numeric format strings

In this article, learn to use standard numeric format strings to format common numeric types into text representations in .NET.

n8ta•2y ago

@jalepi None of these have the desired behavior as far as I can tell Currency: prints $ so won't work Decimal: No decimal places I want them all Exp: Sci notation (no) FixedPoint: I want varying point based on available precision General: sci notation (no) Number: has , separator (even if I remove that with NumberGroupSeparator="" it still has fixed precision Percent: has % RoundTrip: not supported for decimal Hex: no Here's my very unoptimized string munging soln

            var res = value.ToString(CultureInfo.InvariantCulture);
            bool didRemoveZeros = false;
            while (res.EndsWith("0"))
            {
                res = res.Remove(res.Length - 1);
                didRemoveZeros = true;
            }

            if (didRemoveZeros && res.EndsWith("."))
            {
                res = res.Remove(res.Length - 1);
            }
            return res;

            var res = value.ToString(CultureInfo.InvariantCulture);
            bool didRemoveZeros = false;
            while (res.EndsWith("0"))
            {
                res = res.Remove(res.Length - 1);
                didRemoveZeros = true;
            }

            if (didRemoveZeros && res.EndsWith("."))
            {
                res = res.Remove(res.Length - 1);
            }
            return res;

Servator•2y ago

As long as i checked it can be done but i'll be slow af

Stroniax•2y ago

value.ToString().TrimEnd('0'), but this (along with your solution) will chop off the 0 in 70.

n8ta•2y ago

Oh good point I'll have to revise mine to check for the decimal first decimal point* Still would love a native way to either print without .0 or convert 123.0 into 123 brb lunch

Stroniax•2y ago

Think something like this would do, might have to add or remove a char index valueText.IndexOf('.') is int i && i >= 0 ? valueText.Substring(0, valueText.IndexOf('0', i)) : valueText

n8ta•2y ago

Ultimately going with this

            var stringified = value.ToString(CultureInfo.InvariantCulture);

            // Regex matches strings ending with "." followed by 1 or more 0s
            Regex rx = new Regex("(\\.0+)$");
            var match = rx.Match(stringified);
            if (match.Length != 0)
            {
                stringified = stringified.Substring(0, stringified.Length - match.Length);
            }
            return stringified;

            var stringified = value.ToString(CultureInfo.InvariantCulture);

            // Regex matches strings ending with "." followed by 1 or more 0s
            Regex rx = new Regex("(\\.0+)$");
            var match = rx.Match(stringified);
            if (match.Length != 0)
            {
                stringified = stringified.Substring(0, stringified.Length - match.Length);
            }
            return stringified;

jalepi•2y ago

a.ToString("F0") // f zero

MODiX•2y ago

dont#0387

REPL Result: Success

decimal d = 1.23M;
Console.WriteLine($"{d:0}");

decimal d = 1.23M;
Console.WriteLine($"{d:0}");

Console Output

Compile: 655.541ms | Execution: 39.532ms | React with ❌ to remove this embed.

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Convert decimal without trailing 0s