Hi everyone.
When I run the code below, it works fine.
However I have an option at the end of the code to repeat the program ["Press Enter"]
or to end the program ["press "esc"].
The "esc" option works fine.
However if "Enter is chosen, which should bring me back to the start of the program so that
I can enter a new function to solve, when I enter the new function and press "OK"
It tells me I "Entered nothing" in the RequestStr box.
Any help would be greatly appreciated.
Thank you
T Gahan

Code:
```Define LibPub funvarsolv()= Prgm :Local y1,res,var,i,ab,d,c : :Loop :0→c :Loop :1→d :Try :RequestStr "enter function",y1,0,ab :0→d : :Else :© user left input box empty :[color=blue][b]Text "you entered nothing",0[/b][/color] [color=blue]"This comes up everytime the loop is repeated"[/color] :ClrErr : :EndTry :If d=0 :Exit :EndLoop :© user pressed cancel :  If ab=0 Then :      Disp "Press ENTER to  end" :                subrtine\delay() :                  DelVar y1,res,var,i,k,ab :                           Return : :EndIf : :For i,1,dim(y1),1 :If ord(mid(y1,i,1))≥97 and ord(mid(y1,i,1))≤122 Then :var:=char(ord(mid(y1,i,1))) :Exit : :ElseIf ord(mid(y1,i,1))≥65 and ord(mid(y1,i,1))≤90 Then :var:=char(ord(mid(y1,i,1))) :Exit : :ElseIf ord(mid(y1,i,1))≥945 and ord(mid(y1,i,1))≤969 Then :var:=char(ord(mid(y1,i,1))) :Exit : :ElseIf ord(mid(y1,i,1))≥913 and ord(mid(y1,i,1))≤937 Then :var:=char(ord(mid(y1,i,1))) :Exit :Else :Disp "not a function" :EndIf :EndFor : expr("Define y1(var) ="&y1) : res:=exp▶list(solve(y1(#var)=0,#var),#var) : :Disp "function: y1("&var&") = ",y1(#var) : :Disp "Solution set: "&var&" =",res : :subrtine\dlay() :If k="esc" Then :1→c :[color=blue][b]ElseIf k="enter" Then[/b]    [b]"problem here[/b]"[/color] :0→c :EndIf :If c=1 :Exit :EndLoop :EndPrgm```

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