Loop the switch

Question

Hi
I have a switch-statement and three case's. But now I need the switch to start over when it's done with case 2. Ive tried a while loop but it dosen't seems to help. Is there any other way?

switch (row)//Färgalternativ

{

while(true)

{

case 0:

Console.ForegroundColor = ConsoleColor.Yellow;

break;

case 1:

Console.ForegroundColor = ConsoleColor.Magenta;

break;

case 2:

Console.ForegroundColor = ConsoleColor.Green;

break;

}

Frohikki · Answer

So I just solved it, I just % in the switch statment and it turned up ok. switch (row % 3)//färgalternativ { case 0: Console.ForegroundColor = ConsoleColor.Yellow; break; case 1: Console.ForegroundColor = ConsoleColor.Magenta; break; case 2: Console.ForegroundColor = ConsoleColor.Green; break; }

Frohikki · Answer

Thank you, I'm trying to change the colors of the text, every third line it should start over. Yellow -> magenta -> green and then yeloow again. The problem with row is that i use it in a for-loop for the text. And I use row to change colors as well. So it dosen't work to change the colors in the while loop beacuse it affecting the rest of the code and to get the the third line affect with the colors i have to use row. I tought there were a easier way to just start over from case 2 to case 0. I use the %-operator to change the text from row one to row two and then it starts over again but when I try to solve the issue with the colors I get stuck. I have to use an switch statment because it's an assignment for school. Im a newbie, sorry.

theLizard · Answer

what exactly are you trying to do? Where does row get changed? Even if the row is changed in case 2 from 2 to 0, the loop will go on for ever in case 0, however, entry into the loop would have to be at case 2 level for this scenario after this, case 2 or 1 will never be seen . The only way I see to achieve what you want is by creating a thread to watch for the change in row value in which case you do not need a while loop for the switch. If you implement the thread correctly, whenever row value changes, the switch will work on its own. The switch code will need to be inside the thread object's execute method in a loop that checks for the thread objects terminate condition, you should also have a lastRow var so that you do not execute the switch unless row != lastRow. while(!thread.terminate) { if(callerthread.row != lastRow) { synhcronize(whichColor); } } private void whichColor() { switch(callerthread.row) { case 0: callerthread.Console.ForegroundColor = ConsoleColor.Green; break; } } Now I am the first to tell you that I have never used threading objects in c# so the example code is only pseudo .code (the type of code I would use in C++) nothing more, maybe Vulpes can guid you more on threads in c# I also do not know if you can create other threads in console apps

Vulpes · Answer

theLizard's right. I've forgotten to insert a placeholder for code to change the value of row: while(true) { bool reswitch = false; switch (row)//Färgalternativ { case 0: Console.ForegroundColor = ConsoleColor.Yellow; break; case 1: Console.ForegroundColor = ConsoleColor.Magenta; break; case 2: Console.ForegroundColor = ConsoleColor.Green; reswitch = true; row = 0; break; } if (!reswitch) break; } However, you clearly need to do more than just set row to zero as, otherwise, the forground color will change from green to yellow and the switch (and loop) will then exit without the user knowing that it was ever green!

Frohikki · Answer

Thank you for replying. Unfortenly it dosen't work as I had hoped. The Loop is working fine but the if-statment and break is breaking the rest of the program without executing the rest of the program. Isn't there other way to just let the case start over at case 0 when case 2 is done?

theLizard · Answer

Vulpes, sorry but I can't see your solution working too well. As soon as you get into the while loop (will remain there for ever -- while(true)) the value of row will never change and repeat the same case forever. If the switch relies on the value of row, row value must have some way to change it's value even if it is the same value outside of the while loop. For the op to get the result wanted, the while loop must be done at the source of row change or at least where the row change is triggered. Edit: One other way would be to put the loop into a new thread object that looks at the value of a global variable which could be set at the row change event but you would need to know about thread objects and synchronization to do this. Of course I could be missing something and could wrong.

Vulpes · Answer

Try this: while(true) { bool reswitch = false; switch (row)//Färgalternativ { case 0: Console.ForegroundColor = ConsoleColor.Yellow; break; case 1: Console.ForegroundColor = ConsoleColor.Magenta; break; case 2: Console.ForegroundColor = ConsoleColor.Green; reswitch = true; break; } if (!reswitch) break; }