Is it possible to run a loop in a Switch default?

Question

I have written the following code and it works "fine" but it's not the way I would like it. I tried writing a do...while loop in the default option of the switch to force the user input to choose a correct option. It didn't work and so my default closes the program.

Is there a way to make the option choice repeat using switch or do I need to make a class or method to achieve this?

https://code.sololearn.com/c8imNgTp6QK5/?ref=app

Answer 1

public static void main(String[] arg){
int n=1;
boolean repeat=false;
do{
n++; // take input
repeat=false;
switch(n){
case 8:
System.out.println("valid");
break;
default :
System.out.println("invalid");
repeat=true;
}
}while(repeat);

}

// sample. Hope this helps..
// but zemiek answer will be better in your case, I think.

Answer 2

Ahhh! Awesome! Thanks guys

Answer 3

You can make a module or a library for the Switch Case and make a composite logical construct using if...else...endif that integrates these and returns the end result as a FUNCTION. This can be iterated by passing different subsets of values like [[1,5],[3,8]] - one 1×2 array and each element having 2 values.

Answer 4

Put the swich case in do while
Take a boolean value which should be set to true in default case so that loop won't stops.. Otherwise stops,.

Answer 5

or

int selectNum;

do {
selectNum = keyinput.nextInt();
} while (selectNum < 1 ||
selectNum > 6);

switch(selectNum)
{

Answer 6

Ausgrindtube The structure of the function is

void function f(x,y,z){

returns modIntegrator

}

void modIntegrator{
//Mod 1
Switch Case(x):
Case 1:
Case 2:
Else
End Case
//return str(output_a)

//Mod 2
Switch Case(y):
Case 1:
Case 2:
Else
End Case
//return str(output_b)
}

//Mod 3
Switch Case(z):
Case 1:
Case 2:
Else
End Case
//return str(output_z)

returns str(output_x)+str(output_y)+str(output_z)

}
You can read x,y and z from an enum or for each or for loop or array like for(x=0;x<3;x++) or an enum like [0,1,2]

Hope this helps..feel free to ask

Answer 7

I'm sorry Jayakrishna🇮🇳, my brain isn't working out the boolean part.

Would it be as simple as "boolean x = true;"? And if so, how does that stop the code from working?
Can I still include my println after the boolean or should it go before?

Answer 8

I could do Zem's code but it wasn't exactly what I had in mind.
Your example is perfect!

Thanks so much.

Answer 9

You're welcome..

Answer 10

Thanks Sanjay Kamath. I think your solution is way past my ability. Something to look forward to learning!

Answer 11

Sanjay Kamath, you probably answered to another post,
void function f (x, y, z) {
is not java, and why you create 3 switches when only one is in first code..