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EXPRESSION CALCULATION RRS feed

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  • Homework questions?

    Expression based calculator is a popular homework for secondary school to practice "string tokenizing" and "stack manipulation"/"tree transversal" technique.

    EDIT: added "tree transversal" because I've seen solutions based on both approach.

    Tips: On the process of tokenizing the string, if you keep track of the operator precedence level and add missing parenthesis on precedence level change, the calculator logic can be significantly simplified.


    Friday, May 18, 2018 10:03 AM
    Answerer
  • For simple cases:

       string example = "51+25/28+1-(85*87)+54+36*98-45";

       var dt = new DataTable();

       dt.Columns.Add( "r", typeof( double ), example );

       dt.Rows.Add();

       double result = (double)dt.Rows[0][0];

       Console.WriteLine( example );

       Console.WriteLine( result );


    Friday, May 18, 2018 10:28 AM
  • Hi VIVEK KUMAR VERMA,

    Thank you for posting here.

    If you want to calculate this expression in c#, here is a simple example for your reference. You could do it directly in C#.

    int rsult = 51 + 25 / 28 + 1 - (85 * 87) + 54 + 36 * 98 - 45;

    Best Regards,

    Wendy


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    Monday, May 21, 2018 3:07 AM
    Moderator