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I'm getting this error variable might not have been initialized on ch2 and ch3:

```
import javax.swing.JOptionPane;
public class calculatorJava
{
public static void main(String[] args)
{
String ch, ch2, ch3, add1, add2, sub1, sub2, mul1, mul2, div1, div2, choice1, exp;
int chans, chans2, chans3, addo1, addo2, subO1, subO2, mulo1, mulo2, divo1, divo2, exp1, conas=0, choic1;
double adde, sube, mule, dive, expAns;
JOptionPane.showMessageDialog(null, "Calculator");
//selecting level
ch=JOptionPane.showInputDialog("Choose level: \n press 1 for simple math \n press 2 for other functions:");
chans=Integer.parseInt(ch);
if (chans==1) //for simple math
ch2=JOptionPane.showInputDialog("Choose operations: \n press 1 for add \n press 2 for subtract \n press 3 for multiply \n press 4 for divide");
chans2=Integer.parseInt(ch2);
if (chans2==1) //add
do
{
add1=JOptionPane.showInputDialog("Input first number:");
addo1=Integer.parseInt(add1);
add2=JOptionPane.showInputDialog("Input second number:");
addo2=Integer.parseInt(add2);
adde=addo1 + addo2;
JOptionPane.showMessageDialog(null, "Answer: " + addo1 + " + " + addo2 + " = " + adde);
}while(conas==1);
else if (chans2==2) //subtract
do
{
sub1=JOptionPane.showInputDialog("Input first number:");
subO1=Integer.parseInt(sub1);
sub2=JOptionPane.showInputDialog("Input second number:");
subO2=Integer.parseInt(sub2);
sube = subO1 - subO2;
JOptionPane.showMessageDialog(null, "Answer: " + subO1 + " - " + subO2 + " = " + sube);
}while(conas==1);
else if (chans2==3) //multiply
do
{
mul1=JOptionPane.showInputDialog("Input first number:");
mulo1=Integer.parseInt(mul1);
mul2=JOptionPane.showInputDialog("Input second number:");
mulo2=Integer.parseInt(mul2);
mule = mulo1 * mulo2;
JOptionPane.showMessageDialog(null, "Answer: " + mulo1 + " * " + mulo2 + " = " + mule);
}while(conas==1);
else if (chans2==4) //divide
do
{
div1=JOptionPane.showInputDialog("Input first number:");
divo1=Integer.parseInt(div1);
div2=JOptionPane.showInputDialog("Input second number:");
divo2=Integer.parseInt(div2);
dive = divo1 / divo2;
JOptionPane.showMessageDialog(null, "Answer: " + divo1 + " / " + divo2 + " = " + dive);
}while(conas==1);
//for other function
else if (chans==2)
ch3=JOptionPane.showInputDialog("Choose operations: \n press 1 for exponent \n press 2 for binomial \n press 3 for quadratic function");
chans3=Integer.parseInt(ch3);
if (chans3==1)
do
{
exp=JOptionPane.showInputDialog("x^2 \n Input a number for x:");
exp1=Integer.parseInt(exp);
expAns = exp1 * exp1;
JOptionPane.showMessageDialog(null, "Answer: " + expAns);
}while(conas==1);
System.exit(0);
}
}
```

any asap help is much appreciated