C and C++ Programming Resources

[siten0308]

Hello i am still new to C#, has been a month now studying this from VS 2008 C# but now i am concentrating more on code than gui interface, i am looking right now if and else and switch, i decied to use a switch since it is new to me, it keeps giving me that error "implicitly convert type into string, for all 4 cases i made, why? all of the code is below:

Code: Select all

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1{
  class Program{

    static void Main(string[] args){
    string firstn;
    string secondn;
    string thirdn;
    int first;
    int second;
    int third;
    string sign;
    int signn;
    begin:
    switch (thirdn){
    case 1:
        Console.WriteLine("Please enter the first number:");
        firstn = Console.ReadLine();
        first = int.Parse(firstn);
        Console.WriteLine("Please enter if you would like to Add, subtract, multiply, or divide?");
        sign = Console.ReadLine();
        signn = Int32.Parse(sign);
        Console.WriteLine("Please enter the number to add with " + first);       
        secondn = Console.ReadLine();
        second = int.Parse(secondn);
        third = first + second;
        Console.WriteLine(third);
        Console.Read();
    break;
    case 2:
        Console.WriteLine("Please enter the first number:");
        firstn = Console.ReadLine();
        first = Int32.Parse(firstn);
        Console.WriteLine("Please enter if you would like to Add, subtract, multiply, or divide?");
        sign = Console.ReadLine();
        Console.WriteLine("Please enter the second number to subtract with " + first);
        secondn = Console.ReadLine();
        second = Int32.Parse(secondn);
        third = first - second;
        Console.WriteLine(third);
        Console.Read();
    break;
    case 3:
        Console.WriteLine("Please enter the first number:");
        firstn = Console.ReadLine();
        first = Int32.Parse(firstn);
        Console.WriteLine("Please enter if you would like to Add, subtract, multiply, or divide?");
        sign = Console.ReadLine();
        Console.WriteLine("Please enter the second number to multiply with " + first);
        secondn = Console.ReadLine();
        second = Int32.Parse(secondn);
        third = first * second;
        Console.WriteLine(third);
        Console.Read();
    break;
    case 4:
        Console.WriteLine("Please enter the first number:");
        firstn = Console.ReadLine();
        first = Int32.Parse(firstn);
        Console.WriteLine("Please enter if you would like to Add, subtract, multiply, or divide?");
        sign = Console.ReadLine();
        Console.WriteLine("Please enter the second number to divide with " + first);
        secondn = Console.ReadLine();
        second = Int32.Parse(secondn);
        third = first / second;
        Console.WriteLine(third);
        Console.Read();
    break;
    default:
        Console.WriteLine("Please enter a number");
  }

  decide:
    Console.Write("Type \"continue\" to go on or \"quit\" to stop: ");

        firstn = Console.ReadLine();

    // switch with string type

    switch (firstn){

    case "continue":
        goto begin;
    case "quit":
        Console.WriteLine("Good Bye");
        Console.Read();
    break;
    default:
        Console.WriteLine("Your input {0} is incorrect.", firstn);
    goto decide;

}


[msaqib]

HelloYou are trying to use string type variable in your switch statement which is expecting an int type variable. Here is how you are doing

Code: Select all

string thirdn;
switch (thirdn){
  case 1:
  //code
  case 2:
  //code
}

Now the problem is you can not use string type variable in switch statement. You could use it like

Code: Select all

string thirdn;
switch (thirdn){
  case "1":
  //code
  case "2":
  //code
}

Or you could have use int type variable like

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int thirdn;
switch (thirdn){
  case 1:
  //code
  case 2:
  //code
}