C#•6mo ago

✅ Exception thrown: 'System.FormatException' in mscorlib.dll

im just trying to output the data out

67 Replies

Buddy•6mo ago

What datatype is monthr? Also I recommend using string interpolation fully, that is insanely hard to read

noobmaster69OP•6mo ago

monthr is a string into int

leowest•6mo ago

$interpolation

MODiX•6mo ago

String interpolation is the preferred way of building strings in C#. It is easier to read than concatenation. For example:

var foo = 1;
var bar = 2;
Console.WriteLine("foo is equal to: " + foo + " and bar is equal to: " + bar);

var foo = 1;
var bar = 2;
Console.WriteLine("foo is equal to: " + foo + " and bar is equal to: " + bar);

can be written as:

var foo = 1;
var bar = 2;
Console.WriteLine($"foo is equal to: {foo} and bar is equal to: {bar}");

var foo = 1;
var bar = 2;
Console.WriteLine($"foo is equal to: {foo} and bar is equal to: {bar}");

noobmaster69OP•6mo ago

im just doing whatever get me homr I’ll tr this

cap5lut•6mo ago

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

cap5lut•6mo ago

double isnt an integral type

noobmaster69OP•6mo ago

Fork Is there one for double? Caz I need to output as 01 02 etc and I also need to use that to cal something too

cap5lut•6mo ago

why even use the double type when u r only using it as int?

noobmaster69OP•6mo ago

Can I use Int to cal in double? like double = Int + 0.5

cap5lut•6mo ago

tho to answer ur question, u could simply use an explicit format {monthr:00} but i can explain that better on some other explicit format #00.00# # means its an optional digit, 0 is an explicit digit so for 1.5 as value u would get 01.50

noobmaster69OP•6mo ago

{monthr:00} work for both Int and double?

cap5lut•6mo ago

yeah

noobmaster69OP•6mo ago

noice lemme try it Can you answer this tho?

cap5lut•6mo ago

https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-numeric-format-strings explains this one better

noobmaster69OP•6mo ago

getiing somewhere

cap5lut•6mo ago

in arithmetic u can mix the number types, as long as u wont lose precision, so double d = someInt + 0.5; the someInt would be first be "upcasted" to a double, and then u simply have only double values there

noobmaster69OP•6mo ago

ic ic thanks

cap5lut•6mo ago

also, u shouldnt use double but decimal for monetary calculations

noobmaster69OP•6mo ago

how to make 10.208328308 abit shorter to 10.50? no tis okay i actaualy want to round those number later

cap5lut•6mo ago

check out F

noobmaster69OP•6mo ago

i see it now

cap5lut•6mo ago

thats independent of each other. the "normal" floating point types (float and double) use an someValue * 2^someOtherValueinternally to represent a number, decimal uses 10 internally, which is more accurate for monetary calculations

noobmaster69OP•6mo ago

oh alright

cap5lut•6mo ago

u can observe this for example here:

MODiX•6mo ago

cap5lut

REPL Result: Success

Console.WriteLine(0.1 + 0.2);
Console.WriteLine(0.1m + 0.2m);

Console.WriteLine(0.1 + 0.2);
Console.WriteLine(0.1m + 0.2m);

Console Output

0.30000000000000004
0.3

0.30000000000000004
0.3

Compile: 402.499ms | Execution: 23.600ms | React with ❌ to remove this embed.

cap5lut•6mo ago

m is the suffix to use the number as decimal type, just like f is used for float

noobmaster69OP•6mo ago

https://tenor.com/view/surprised-pikachu-pokemon-shock-surprised-pikachu-gif-15357817

Tenor

noobmaster69OP•6mo ago

I just need to put :m like this right? I just try to use declare all double into decimal but that would cause some error if it’s too much trouble then I’m okay with this caz It actually doing what I want them to

cap5lut•6mo ago

yeah, because the numbers u have in code like for example 1.5 are still doubles, u have to use the m suffix there eg float someFloat = 1.5; would not compile either, because 1.5 is a double value, float someFloat = 1.5f; would compile tho and ofc decimal someDecimal = 1.5m;

noobmaster69OP•6mo ago

cap5lut•6mo ago

for some homework or private training project it will be fine to use double i assume

noobmaster69OP•6mo ago

Yea it’s an assignment will have to hand it over tmr

noobmaster69OP•6mo ago

hey im sorry to bother you but can you explain why is the final installment is not 10.56 instead it goes down by 0.01 to 10.55

noobmaster69OP•6mo ago

double installment = (loan * interestRate) / (1 - Math.Pow((1 + interestRate), -month)); to be clear this is not my work its what im aiming toward

cap5lut•6mo ago

can u print the value without any formating, as in just Console.WriteLine(theValue);? and the respective $code

MODiX•6mo ago

To post C# code type the following: ```cs // code here ``` Get an example by typing $codegif in chat For longer snippets, use: https://paste.mod.gg/

noobmaster69OP•6mo ago

    if (int.TryParse(inputs[0], out int number1) && int.TryParse(inputs[1], out int number2) && int.TryParse(inputs[2], out int number3))
    {    
        if (number1 < 31 || number2 < 12)
        {
            if (number1 > 0 || number2 > 0 || number3 > 0)
            {
                double m = monthe;
                int monthr = number2;
                int yearr = number3;
                double debtbal = loan;
                double interest = loan * interestrate;
            Console.WriteLine("\nMonth\t\tInstallment\tPrincipal\tInterest\tDebt Balance");
            for (double i = 0; i < m; i++)
            {
                monthr = monthr + 1; 
                double installment = (loan * interestrate) / (1 - Math.Pow((1 + interestrate), -monthe));

                interest = debtbal / 100;
                double principle = installment - interest;
                debtbal = debtbal - principle;
                
                double interesrate = debtbal / 100;
                if (monthr > 12)
                {
                    monthr = 1;
                    yearr = yearr + 1;
                }
                Console.WriteLine($"{number1}-{monthr:00}-{yearr}\t${installment:f}\t\t${principle:f}\t\t${interest:f}\t\t${debtbal:f}");
            }
            }else
                Console.WriteLine("Invalid input. Please enter three integers separated by a -.");     
        }else
        {
            Console.WriteLine("Invalid input. Please enter three integers separated by a -.");
        }
         
    }
    else
    {
    Console.WriteLine("Invalid input. Please enter three integers separated by a -.");
}

    if (int.TryParse(inputs[0], out int number1) && int.TryParse(inputs[1], out int number2) && int.TryParse(inputs[2], out int number3))
    {    
        if (number1 < 31 || number2 < 12)
        {
            if (number1 > 0 || number2 > 0 || number3 > 0)
            {
                double m = monthe;
                int monthr = number2;
                int yearr = number3;
                double debtbal = loan;
                double interest = loan * interestrate;
            Console.WriteLine("\nMonth\t\tInstallment\tPrincipal\tInterest\tDebt Balance");
            for (double i = 0; i < m; i++)
            {
                monthr = monthr + 1; 
                double installment = (loan * interestrate) / (1 - Math.Pow((1 + interestrate), -monthe));

                interest = debtbal / 100;
                double principle = installment - interest;
                debtbal = debtbal - principle;
                
                double interesrate = debtbal / 100;
                if (monthr > 12)
                {
                    monthr = 1;
                    yearr = yearr + 1;
                }
                Console.WriteLine($"{number1}-{monthr:00}-{yearr}\t${installment:f}\t\t${principle:f}\t\t${interest:f}\t\t${debtbal:f}");
            }
            }else
                Console.WriteLine("Invalid input. Please enter three integers separated by a -.");     
        }else
        {
            Console.WriteLine("Invalid input. Please enter three integers separated by a -.");
        }
         
    }
    else
    {
    Console.WriteLine("Invalid input. Please enter three integers separated by a -.");
}

$codegif

MODiX•6mo ago

https://cdn.discordapp.com/attachments/364492811489509376/892176158312001586/code.gif

noobmaster69OP•6mo ago

you know what its already pretty close to what i set out to do

noobmaster69OP•6mo ago

just 0.01 dollar so i dont think its matter but how do i make it so that whenever i use \t it instead replace the space between the tab with -? like this

cap5lut•6mo ago

well, that doesnt show anything about the total interest (nor ur screenshot)

noobmaster69OP•6mo ago

ah i can easily do the total

cap5lut•6mo ago

i never really dabbled that much into formating, but most likely u would have to do that manually

noobmaster69OP•6mo ago

but the finall installment why is it 10.55

cap5lut•6mo ago

oh there, didnt notice that one

noobmaster69OP•6mo ago

ic ic i'll do it manaully i just hope that its symmetrical yea that one i dunno how he do it using the formula he provided this one but for me its a one and done nvr bring the formula to cal again

cap5lut•6mo ago

well there are methods on string for padding, basically u would do something like string paddedString = yourDoubleValue.ToString("F2").PadRight(17, '-') to get ur value formatted and then padded on the right side with -s until it has a length of 17 or greater https://learn.microsoft.com/en-us/dotnet/api/system.string.padleft?view=net-8.0 https://learn.microsoft.com/en-us/dotnet/api/system.string.padright?view=net-8.0

noobmaster69OP•6mo ago

i dont get it but i'll mess around with it

cap5lut•6mo ago

that the last one is different seems more like an imprecision that comes when doing calculations with floating point types

noobmaster69OP•6mo ago

that would be he calculate it multiple time

cap5lut•6mo ago

well, not much i can say besides that when just seeing a screenshot *shrugs*

noobmaster69OP•6mo ago

yea 😂 nope i couldnt do it if i were to add padding using string then i would have to convert the double into string then i wouldnt beable to use :f to show .00 manual is not an option as well caz its not symmetical

cap5lut•6mo ago

$"{someDouble:blahblah}" is the same as someDouble.ToString("blahblah")

MODiX•6mo ago

cap5lut

REPL Result: Success

double someDouble = 1.234567;
someDouble.ToString("F2").PadRight(17, '-')

double someDouble = 1.234567;
someDouble.ToString("F2").PadRight(17, '-')

Result: string

1.23-------------

1.23-------------

Compile: 315.168ms | Execution: 26.450ms | React with ❌ to remove this embed.

noobmaster69OP•6mo ago

omg letmme try it

noobmaster69OP•6mo ago

just look at the stuff im trying

noobmaster69OP•6mo ago

doesnt seem to work

noobmaster69OP•6mo ago

i mustve cout wrong

cap5lut•6mo ago

someDouble.ToString("F2").PadRight(17, '-'); returns a string if u just use it like that u just discard the string. u would do something like,

string installmentColumn = installment.ToString("F2").PadRight(17, '-');
Console.WrilteLine($"date-stuff {installmentColumn} same for the rest");

string installmentColumn = installment.ToString("F2").PadRight(17, '-');
Console.WrilteLine($"date-stuff {installmentColumn} same for the rest");

im sorry, i should have explained that better

noobmaster69OP•6mo ago

alright ty no its okay yep its work ty so much thats all for now tysm for helping me i'll be bek in a while to send the final result

noobmaster69OP•6mo ago

cap5lut•6mo ago

oh one more thing if (number1 > 0 || number2 > 0 || number3 > 0), im pretty sure that all of these numbers have to be greater than zero, right? || is "or" and same thing for if (number1 < 31 || number2 < 12)

noobmaster69OP•6mo ago

Yes || is or Same thing with if Sorry. I didn’t reply sooner I went to bed asa I posted it

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✅ Exception thrown: 'System.FormatException' in mscorlib.dll