Click here to Skip to main content
13,740,333 members
Rate this:
Please Sign up or sign in to vote.
See more:
The console program writes acalculator to satisfy addition and subtraction multiplication

What I have tried:

    float n = float.Parse(Console.ReadLine());
   // Console.Write("请选择符号(+,-,*,/,%):");

    float m = float.Parse(Console.ReadLine());
    string k = "";
switch (k)
    case "*": float x = m * n; break;
    case "/": float y = m / n; break;
    case "+": float z = m + n; break;
    case "-": float w = m - n; break;
    case "%": float q = m % n; break;
Posted 10-Nov-17 4:18am
Updated 10-Nov-17 4:30am

1 solution

Rate this: bad
Please Sign up or sign in to vote.

Solution 1

No, that won't work.
Look at your code, and it's obvious that its isn't right: which one of the switch statements is going to be executed? None of them - because k is always an empty string.

For starters, don't use float.parse to convert numbers: use float.TryParse or better, use double.TryParse instead. And what I'd suggest is writing a method to return a number:
private static double GetNumber(string prompt)
   double result;
      string inp = Console.ReadLine();
      if (double.TryParse(inp, out result))
      Console.WriteLine("I'm sorry, but that wasn't a valid number. Please try again.");
      } while (true);
   return result;
You can then call that twice to fetch the two operands.
Then use Console.ReadLine to fetch the operator, and execute the switch statement on the user input.
Karthik Bangalore 10-Nov-17 12:28pm
George Swan 11-Nov-17 7:34am
shouldn't that be
OriginalGriff 11-Nov-17 7:40am
What! You want me to find the SHIFT key *twice* in the same word? :laugh:

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

  Print Answers RSS
Top Experts
Last 24hrsThis month

Advertise | Privacy | Cookies | Terms of Service
Web01-2016 | 2.8.180920.1 | Last Updated 11 Nov 2017
Copyright © CodeProject, 1999-2018
All Rights Reserved.
Layout: fixed | fluid

CodeProject, 503-250 Ferrand Drive Toronto Ontario, M3C 3G8 Canada +1 416-849-8900 x 100