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Gus Hayes
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Hi,
I downloaded a Basic Calculator program from Planet Source Code called BasicCalc_III. I wrote it out again in Eclipse to try and understand every aspect of it. The program itself is too large to put here so I am putting some of the code I am having difficulty with up here. Hope someone can help me understand the MyPrint() part of this.

public void actionPerformed( ActionEvent e ) {

tempNum = "" + answer ;

if ( e.getSource() == bPlus || e.getSource() == bSub ||
e.getSource() == bMult || e.getSource() == bDiv ) {
tempNum = "" + answer ;

MyPrint( "actionPerformed() 1a: The value of result is " + result +
" The value of tempNum is " + enterBox.getText() +
" The value of opCode is " + opCode ) ;
}
This is the actionPerformed method but I don't understand what MyPrint does. The MyPrint method is shown below:


/** *******************************************************
* MyPrint() - toggles debug aid on or off
* ******************************************************/
public void MyPrint( String str ) {
if ( myDiag )
System.out.println( str );

}
/** ********** End of MyPrint() *****************************/

Hope this makes sense
.
Regards,
Gus
 
Paul Clapham
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Here's a hint: The comment at the top of the method is completely incorrect. So go past that and look at the actual code. It isn't that complicated... so what do you think it does?
 
Paul Mrozik
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It prints the String passed to it if myDiag is set to true.

 
Gus Hayes
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Thanks guys for the prompt replies.
This MyPrint appears in lots of the classes in this program. Where does it print to. Is it like System.out.println(). I am a newbie and this is confusing me. Below is another example of it from the same program:

/** ***********************************************************
* MyATan() - computes the arc tangent of the entered number.
* The logic is:
* 1- If there is a pending operation, proces it.
* 2- Take the squareroot of the value in the enter box field.
* 3- Store the anser into firstNum and dNum1
* 4- Set the secondNum to null
* 5- Enter firstNum/answer into the enter box field
* 6- Set dNum2 to 0.0
* 7- Indicate that there are no pending oprations.
* **************************************************************/
public void MyATan() {
MyPrint( "MyATan() 1: opCode is " + opCode + " firstNum is " + firstNum +
"pendingOpCode =s " + pendingOpCode +
" pendingOp =s " + pendingOp ) ;
if ( pendingOpCode >= 0 ) {
MyPrint( "MyATan() 2: pendingOpCode =s " + pendingOpCode ) ;
pendingOp = true ;
opCodeMethod() ;
}

Where does MyPrint actually send the information to?
Thanks and regards,
Gus
 
Paul Clapham
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Here's the operational line of that code (there are only two lines):



But it seems you already know what this code does. Am I missing something in your question?
 
Gus Hayes
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Hi Paul,
Thanks for the reply but what does this code do. Am I right in saying the MyPrint() method is called and it prints what is inside the brackets or sends what is inside the brackets to the MyPrint() method. As I am a newbie it is confusing me.


MyPrint( "MyATan() 1: opCode is " + opCode + " firstNum is " + firstNum +
"pendingOpCode =s " + pendingOpCode +
" pendingOp =s " + pendingOp ) ;
if ( pendingOpCode >= 0 ) {
MyPrint( "MyATan() 2: pendingOpCode =s " + pendingOpCode ) ;
pendingOp = true ;
opCodeMethod() ;
}


Thanks,
Gus
 
Paul Mrozik
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Am I right in saying the MyPrint() method is called and it prints what is inside the brackets or sends what is inside the brackets to the MyPrint() method. As I am a newbie it is confusing me.


Yes, you are right, but do notice that there's a conditional statement in the MyPrint() method. If you want to see what it does, find the myDiag field declaration and set it to true. Then compile/run the program and keep your eyes on the console while performing different calculations.
 
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