doubt in lwuit project

[kumarv75]

Hi I am doing a calculator project in lwuit the problem now I am facing is when the operations are pressed it does not start a new value and also please tell me how to store a value temporarily .........................up till now I have created the form that contains the buttons and the text area where to display and also have seperated the numbers and operators ,as in a windows calculator the numbers would only cum not the operators am dng the similar way can u help me please........................

[ektasrv]

Hi I am doing a calculator project in lwuit the problem now I am facing is when the operations are pressed it does not start a new value and also please tell me how to store a value temporarily .........................up till now I have created the form that contains the buttons and the text area where to display and also have seperated the numbers and operators ,as in a windows calculator the numbers would only cum not the operators am dng the similar way can u help me please........................

when the operations are pressed it does not start a new value ---> looks to be the problem in your logic, share the codelet to debug.
please tell me how to store a value temporarily ---> take temp variable and assign it.

[kumarv75]

when the operations are pressed it does not start a new value ---> looks to be the problem in your logic, share the codelet to debug.
please tell me how to store a value temporarily ---> take temp variable and assign it.

what is a codelet ??????

[kumarv75]

when the operations are pressed it does not start a new value ---> looks to be the problem in your logic, share the codelet to debug.
please tell me how to store a value temporarily ---> take temp variable and assign it.

hi I have written the code as follows


protected boolean secondValueStarted = false;\\decleared globally

String operations =("+-/*=");

if(ae.getSource() instanceof Button)
{if(operations.indexOf(btn.getText())> -1)
{
doOperations(operation);
}

public void doOperations(String operand)
{
if(valueone.equals(""))
{
valueone = txt.getText();\\value one would be stored here
operation = operand;
secondValueStarted = false;
}
if(operand.equals("="))
{
if(operand.equals("+"))
{
float result = Float.parseFloat(valueone) + Float.parseFloat(valuetwo);
resetCalculator();
valueone=""+result;
txt.setText(String.valueOf(result));
}
}

can u tell me what is wrong in my logic that u fell............................

[ektasrv]

hi I have written the code as follows


protected boolean secondValueStarted = false;\\decleared globally

String operations =("+-/*=");

if(ae.getSource() instanceof Button)
{if(operations.indexOf(btn.getText())> -1)
{
doOperations(operation);
}

public void doOperations(String operand)
{
if(valueone.equals(""))
{
valueone = txt.getText();\\value one would be stored here
operation = operand;
secondValueStarted = false;
}
if(operand.equals("="))
{
if(operand.equals("+"))
{
float result = Float.parseFloat(valueone) + Float.parseFloat(valuetwo);
resetCalculator();
valueone=""+result;
txt.setText(String.valueOf(result));
}
}

can u tell me what is wrong in my logic that u fell............................

I cannot see, where have you assigned value to variable valuetwo?
try
float result = Float.parseFloat(valueone) + Float.parseFloat(txt.getText());

[kumarv75]

I cannot see, where have you assigned value to variable valuetwo?
try
float result = Float.parseFloat(valueone) + Float.parseFloat(txt.getText());

Thank u ekta with ur suggestion am able to perform + and * operations but for -and / the value that is coming is wrong..............................
if (operand.equals("="))
{

if (operation.equals("-"))
{
float result = Float.parseFloat(valueone)- Float.parseFloat(txt.getText());
resetCalculator();
valueone = "" + result;
txt.setText(String.valueOf(result));
}

if (operation.equals("/"))
{
float result = Float.parseFloat(valueone)/ Float.parseFloat(txt.getText());
resetCalculator();
valueone = "" + result;
txt.setText(String.valueOf(result));
}
}

[kumarv75]

I cannot see, where have you assigned value to variable valuetwo?
try
float result = Float.parseFloat(valueone) + Float.parseFloat(txt.getText());

can u tell me how to get the new value when an operation is pressed ................the value is keep on coming continuesly

[ektasrv]

can u tell me how to get the new value when an operation is pressed ................the value is keep on coming continuesly

you get the new value from the Text box after the = operator is pressed by txt.getText().
If this works in + & *, it should also work in - or /, just check with a SOP that txt.getText() is not null or "".

[kumarv75]

you get the new value from the Text box after the = operator is pressed by txt.getText().
If this works in + & *, it should also work in - or /, just check with a SOP that txt.getText() is not null or "".

I am able to perform all the operations with valuetwo itself but am able to get the answer only if I click the = symbol ..................say if its 2+3+2+......... the result is not coming and it is coming continuesly .........................this is a bug that am facing now

[ektasrv]

I am able to perform all the operations with valuetwo itself but am able to get the answer only if I click the = symbol ..................say if its 2+3+2+......... the result is not coming and it is coming continuesly .........................this is a bug that am facing now

This is happening because you workout the result only when (operand.equals("=")) { }, you also need to do this if the operand =operation
so modify it to:

if (operand.equals("=") || operand.equals(operation)) {

// perform all operations
}

[kumarv75]

This is happening because you workout the result only when (operand.equals("=")) { }, you also need to do this if the operand =operation
so modify it to:

if (operand.equals("=") || operand.equals(operation)) {

// perform all operations
}

hi even thn am not able to get .............

if (operand.equals("=") || (operand.equals(operation)))
{
valuetwo = txt.getText();

if (operation.equals("+"))
{
float result = Float.parseFloat(valueone)+ Float.parseFloat(valuetwo);
valueone = ""+ result;
resetCalculator();
txt.setText(String.valueOf(result));
}

[ektasrv]

Put a few SOP to see the flow is reaching here or not.

hi even thn am not able to get .............


System.out.println("I am here");
if (operand.equals("=") || (operand.equals(operation)))
{
System.out.println("I am here: 1");
valuetwo = txt.getText();
System.out.println("I am here: 2 - valuetwo "+valuetwo );
if (operation.equals("+"))
{
System.out.println("I am here: inside +");
float result = Float.parseFloat(valueone)+ Float.parseFloat(valuetwo);
valueone = ""+ result;
resetCalculator();
txt.setText(String.valueOf(result));
}

[kumarv75]

Put a few SOP to see the flow is reaching here or not.

HI am able to get the result now but its continues in the sense say 1+1+1 it gives 13 it give the last entered value with the result ....................

[ektasrv]

HI am able to get the result now but its continues in the sense say 1+1+1 it gives 13 it give the last entered value with the result ....................

try to put txt.setText(" "); before
txt.setText(String.valueOf(result));

[kumarv75]

try to put txt.setText(" "); before
txt.setText(String.valueOf(result));

Hi I am getting an exeception now while evaluating the condition if (operand.equals("=")|| (operand.equals(operation)))