CODEWITHSUNDEEP
freepascal
NicuAndries
NicuAndries

Reputation: 1

Nonzero exit status : 216 (Pascal).. How can i fix this error?

I tried everything : to change the data type, to initialize the variables before using them, but nothing worked, what is the problem?

Program Criptmat;
   type Matrice = array[1..20,1..20] of char;

    var x : Matrice;
     s,s1 : string;
      i,j,n,k,l : integer;
        f,f1 : text;

begin
 assign(f,'criptmat.in');
  reset(f);
   readln(f,n);
  readln(f,s);
 close(f);

   k:=1;
    l:=length(s) div n;

    for i:=1 to l do
     if i mod 2 = 1 then
      for j:=1 to n do  
        begin
          x[i,j]:=s[k];
         k:=k+1;
        end else
       if i mod 2 = 0 then
        for j:=n downto 1 do 
         begin
          x[i,j]:=s[k];
           k:=k+1;
         end;

     s1:='';

    for j:=1 to n do
     for i:=1 to l do
      s1:=s1+x[i,j];

 assign(f1,'criptmat.out');
  rewrite(f1);
   writeln(f1,s1);
  close(f1);
 end.

Please, help me to fix this error to avoid this kind of mistake in the future, thank you!

Upvotes: 0

Views: 1079

Answers (1)

David Heffernan
David Heffernan

Reputation: 613612

Error 216 in fpc is an access violation or segment fault, depending on your preferred terminology. This happens when you try to access a memory address that is not valid. Typically that happens when you attempt to access an array outside of its bounds, or access dynamically allocated memory that has already been deallocated.

In your case it is likely that you are accessing the array out of bounds. Use the debugger to locate the point of failure, and inspect the value of your indices at that point of execution. This will tell you which access is invalid, and then you can set about fixing the logic errors that lead to the out of bounds access.

A useful tool to help such debugging is to enable the range checking compilation option. This will inject runtime code to validate every array access. You will find it much easier to debug these faults with that enabled.

Upvotes: 1

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