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Help！

4. The following code is part of a high level program to manipulate text:
Var S1: String
Var S2: String
Var Ptr: Integer
Var L: String

S1 := “PAT”
S2 := “” {“” denotes an empty string}

For Ptr := 1 To 3 Do
L := Copy (S1, Ptr)
S2 := Concat (L, S2)
EndFor

If S1 = S2
Then Print (‘True’)
Else Print (‘False’)
EndIf

(c) Dry run the above code by completing the table below.
S1　　　Ptr　　　L　　　S2
"PAT"　　　?　　　? 　　 ""
? 　　　1 　　　"P" 　　　"P"
? 　　　? 　　　? 　　　?
? 　　　? 　　　? 　　　?
Printed Output 　　?

THX!!

Reply 1

xeonman9000


S1&#12288;&#12288;&#12288; Ptr&#12288;&#12288;&#12288;L&#12288;&#12288;&#12288; S2
"PAT"   NULL&#12288; NULL  ""
"PAT"&#12288; 1 &#12288;&#12288;&#12288;"P" &#12288;  "P"
"PAT"&#12288; 2 &#12288;&#12288;&#12288;"A" &#12288;  "AP"
"PAT"&#12288; 3 &#12288;&#12288;&#12288;"T" &#12288;  "TAP"

Printed Output &#12288;&#12288;FALSE