C# - how first result will be devided with secend result for division

Question

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Hi,
I have below code for division. I can't divide first output with second output. Please help.

first Result is = 1.5
Second Result is = 0.5

Total Result will be = 3 (first Result / Second Result)

What I have tried:

string mExp = "3/2/1/2";
           string[] strNum = (Regex.Split(mExp, @"\s*[+/*-]\s*"));


           List<string> stringList = mExp.Split('/').ToList();

           int i;
           for (i = 0; i < stringList.Count - 1;  i++)
           {
               string a = stringList[i];
               string b = stringList[i + 1];
               decimal c = int.Parse(a);
               decimal d = int.Parse(b);
               decimal e = c / d;
               Console.WriteLine(e);
               i++;
               Console.ReadLine();
           }

Posted 28-Feb-22 20:25pm

HelalCtg

Updated 28-Feb-22 20:54pm

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Comments

CPallini 1-Mar-22 2:34am

Why 3/2/1/2 should produce 3? Shouldn't instead produce 0.75?
Do you mean (3/2)/(1/2)?

OriginalGriff 1-Mar-22 2:55am

He's trying to create a fraction calculator, he's been on it for a week or so.
Trouble is, he doesn't really want to think too hard, or listen to what we tell him ... :sigh:

HelalCtg 1-Mar-22 4:33am

Hi OriginalGriff, I am trying to implement that fraction in the way of string process. Sometimes getting wrong result. If ok in console application, that will be implemented in Windows Form. Thanks.

HelalCtg 1-Mar-22 2:49am

Yes, it will be (3/2)/(1/2). Thanks.

Chris Copeland 1-Mar-22 5:01am

Take a look at my Math Equation Parsing using Call Stacks article.

2 solutions

Solution 2

I explained all this to you 5 days ago: Fraction calculator C# windows form[^]

It hasn't changed. You need to implement operator precedence and brackets to get teh result you want.

3 / 2 / 1 / 2

is not the same thing as

3 / 2
_____
1 / 2

Or

(3 / 2) / (1 / 2)

Try it on a "regular calculator" and you'll see. Without the brackets, the divide operators have equal precedence, so so are evaluated like this:

((3 / 2) / 1) / 2

Posted 28-Feb-22 20:54pm

OriginalGriff

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M Imran Ansari · Accepted Answer · 2022-02-28T20:38:00

No need to declare extra variables and inside the loops. Try the following code to divide you first and second result:

string mExp = "3/2/1/2";
string[] strNum = (Regex.Split(mExp, @"\s*[+/*-]\s*"));
List<string> stringList = mExp.Split('/').ToList();
int i;
decimal c, d, e = 0;
for (i = 0; i < stringList.Count - 1; i++)
{
   c = int.Parse(stringList[i]);
   d = int.Parse(stringList[i + 1]);
   if (i == 0)
       e = c / d;
   else
   {
       e /= c / d;
   }
   i++;
}
Console.WriteLine(e);
Console.ReadLine();