(Newbie) Needs help with math equation

[bencoding]

Hello, I've been learning C# for a few months now and still learning, I come from a PHP background where declaring the variable types is not involved.

I would like to do this simple math problem in C#, is there anyone who can help me?

Number A: Is a monetary value with dollars and cents (eg 199.95)
Number B: Is a numerical percentage value (eg 90%) without the percent sign


My code here returns $17995.50 when the answer I am looking for is $179.95

 
decimal DollarAmt = 199.95;
int PercentAmt = 90;
 
decimal result = DollarAmt * PercentAmt ;
 
//returns bad result of 17995.50 - help!
Response.Write(result);

[developing]

hey

firstly, you should post this in C# section and not in C/C++ section

now, when you look at 90%, you realize that it is 90 of 100 or 90/100.

c# doesnt know that, so you need to divide 'PercentAmt' by 100 by

PercentAmt /= 100;

also, since you are doing this for the web, i recommend using 'float' or 'double' instead of 'decimal' as they take less memory.

float - 32 bit
double - 64 bit
decimal - 128 bit

[bencoding]

ok, thanks, I didn't see the C# section before,.... that was helpful and got me one step closer, so when I do this I get a long string past the decimal, is there a round() function that will round it up to the nearest cent? (see my code results)

        float per = 90;
        float conv_per = p / 100;
 
        double dol = 199.95;
 
        double a = conv_p * dol;
 
        // Returns 179.95499523282 
        Response.Write(a);

[bencoding]

ah I found this,

Math.Round(result,2);

works! thanks for the help.

[developing]

Math.Round(a, 2);

that should be it.