Math.atan2 Code Explanation Help

Hello guys
This is a piece of code from AS3 Making Things Move
I tried to understand how this code works, but failed
Please explain this code
Thanks in advance

There are two fetches to deal with the no records found situation.
the basic idea is
fetch
while found loop
... do some processing ...
fetch
end loop
If the first fetch doesn't result in a record the loop is not being executed,inside the loop the %notfound situation doesn't have to be trapped anymore.
This is why the if inside the loop is redundant.
Other than that this code is an example of slow by slow processing, introducing 3GL techniques, processing records, instead of SETS.
The person responsible for this code ought to be fired.
Sybrand Bakker
Senior Oracle DBA

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Code explanation help

Declare
CURSOR curEMP is
     Select Empno,Fname,Lname,Sal From Emp;
varEmpno Emp.Empno%type;
varFname Emp.Fname%type;
varLname Emp.Lname%type;
varSal   Emp.Sal%type;
varUname Emp.Uname%type;
varpwd   Emp.pwd%type;
Begin
Open curEMP;
If curEmp%ISOPEN Then
Fetch curEMP
INTO varEmp,varfname,varLname,varSal;
While curEMP%FOUND
LOOP
Exit When curEMp%NOTFOUND;
IF curEMp%FOUND THEN
varUname:=SUBSTR(varFname,-2,2);
varPwd:=Substr(varLname,2,2);
Update EMP set Uname=varUname,pwd=varPwd where Empno=varempno;
Fetch curEMP INTO varEMpNo,varFname,varLname,varSal;
End IF;
End Loop;
commit;
Else
Dbms_Output.Put_line('No recd found');
End IF;
Close curEmp;
End;
Could you help me why do "fetch statements" in this code used twice.
Thanks & Regard
pallis

There are two fetches to deal with the no records found situation.
the basic idea is
fetch
while found loop
... do some processing ...
fetch
end loop
If the first fetch doesn't result in a record the loop is not being executed,inside the loop the %notfound situation doesn't have to be trapped anymore.
This is why the if inside the loop is redundant.
Other than that this code is an example of slow by slow processing, introducing 3GL techniques, processing records, instead of SETS.
The person responsible for this code ought to be fired.
Sybrand Bakker
Senior Oracle DBA

Improvements to status code explanations requested

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CAPI_STAT_DATA_ENCODING = Information about the encoding of supplied data.
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Thanks Aaron,
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Best regards,
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Math.atan2 Code Explanation Help

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