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Problem with a list?

Poppe25Poppe25 Member Posts: 17
I would be very grateful if someone could help me out with this one.
I've a program were the user should put in data about dogs, and then be able to write them out on the screen.

PROGRAM inlu5(Input, Output);
TYPE String_15=packed ARRAY[1..15] of CHAR;

hundpekare =^hundtyp;

hundtyp=record
namn : String_15;
ras : String_15;
age : Integer;
vikt : Integer;
next : hundpekare;
END;


VAR first,ny,temp : hundpekare;
continue : Boolean;
kom : Char;
i,antal : Integer;

BEGIN
Writeln('Welcome to dogprogram!');

new(first);
first^.next:=NIL; {pekaren nollstlls}
Write('Name of dog?'); Readln(first^.namn);
Write('Race of dog?'); Readln(first^.ras);
Write('Age of dog?');Readln(first^.age);
Write('Weight of dog?'); Readln(first^.vikt);

continue:=true;
Repeat
BEGIN
Write('Do you want to put in data about another dog?Y/N');
Readln(kom);
CASE kom OF
'Y','y': BEGIN

new(temp);
temp:=first;
Writeln(first^.namn:5,':',first^.ras:5,':',first^.age:2,' first^.'); Writeln(temp^.namn:5,':',temp^.ras:5,':',temp^.age:2,' temp^.');

repeat
BEGIN
Writeln('Loop!');
temp:=temp^.next;
END;
until (temp^.next=NIL);

Write('Name?'); Readln(temp^.next^.namn);
Write('Race?'); Readln(temp^.next^.ras);
Write('Age?');Readln(temp^.next^.age);
Write('Weight?'); Readln(temp^.next^.vikt);
temp:=NIL;
END;
'N','n': continue:=false;
Otherwise
BEGIN
Writeln('Wrong kommando, try again!');
continue:=true;
END;
END;
END;
Until NOT continue;

Writeln(antal);
Write('Do you want to write the register? Y/N:');
Readln(kom);
Case kom of
'Y','y': BEGIN
{ I dont know how to make this correct}
END;
'N','n': Writeln('Bye');
Otherwise Writeln('Wrong kommando. Bye!');
END;
END.

Comments

  • zibadianzibadian Member Posts: 6,349
    : I would be very grateful if someone could help me out with this one.
    : I've a program were the user should put in data about dogs, and then be able to write them out on the screen.
    :
    : PROGRAM inlu5(Input, Output);
    : TYPE String_15=packed ARRAY[1..15] of CHAR;
    :
    : hundpekare =^hundtyp;
    :
    : hundtyp=record
    : namn : String_15;
    : ras : String_15;
    : age : Integer;
    : vikt : Integer;
    : next : hundpekare;
    : END;
    :
    :
    : VAR first,ny,temp : hundpekare;
    : continue : Boolean;
    : kom : Char;
    : i,antal : Integer;
    :
    : BEGIN
    : Writeln('Welcome to dogprogram!');
    :
    : new(first);
    : first^.next:=NIL; {pekaren nollstlls}
    : Write('Name of dog?'); Readln(first^.namn);
    : Write('Race of dog?'); Readln(first^.ras);
    : Write('Age of dog?');Readln(first^.age);
    : Write('Weight of dog?'); Readln(first^.vikt);
    :
    : continue:=true;
    : Repeat
    : BEGIN
    : Write('Do you want to put in data about another dog?Y/N');
    : Readln(kom);
    : CASE kom OF
    : 'Y','y': BEGIN
    :
    : new(temp);
    : temp:=first;
    : Writeln(first^.namn:5,':',first^.ras:5,':',first^.age:2,' first^.'); Writeln(temp^.namn:5,':',temp^.ras:5,':',temp^.age:2,' temp^.');
    :
    : repeat
    : BEGIN
    : Writeln('Loop!');
    : temp:=temp^.next;
    : END;
    : until (temp^.next=NIL);
    :
    : Write('Name?'); Readln(temp^.next^.namn);
    : Write('Race?'); Readln(temp^.next^.ras);
    : Write('Age?');Readln(temp^.next^.age);
    : Write('Weight?'); Readln(temp^.next^.vikt);
    : temp:=NIL;
    : END;
    : 'N','n': continue:=false;
    : Otherwise
    : BEGIN
    : Writeln('Wrong kommando, try again!');
    : continue:=true;
    : END;
    : END;
    : END;
    : Until NOT continue;
    :
    : Writeln(antal);
    : Write('Do you want to write the register? Y/N:');
    : Readln(kom);
    : Case kom of
    : 'Y','y': BEGIN
    : { I dont know how to make this correct}
    : END;
    : 'N','n': Writeln('Bye');
    : Otherwise Writeln('Wrong kommando. Bye!');
    : END;
    : END.
    :
    :
    Here is a much easier and workable code to ask the user for a certain record:
    [code]
    : PROGRAM inlu5(Input, Output);
    : TYPE String_15=packed ARRAY[1..15] of CHAR;
    :
    : hundpekare =^hundtyp;
    :
    : hundtyp=record
    : namn : String_15;
    : ras : String_15;
    : age : Integer;
    : vikt : Integer;
    : next : hundpekare;
    : END;
    :
    :
    : VAR first,ny,temp : hundpekare;
    : continue : Boolean;
    : kom : Char;
    : i,antal : Integer;
    :
    : BEGIN
    : Writeln('Welcome to dogprogram!');
    :
    : new(first);
    : first^.next:=NIL; {pekaren nollstlls}
    : Write('Name of dog?'); Readln(first^.namn);
    : Write('Race of dog?'); Readln(first^.ras);
    : Write('Age of dog?');Readln(first^.age);
    : Write('Weight of dog?'); Readln(first^.vikt);
    Temp := First; { Get the "last" valid record }
    Repeat
    : Write('Do you want to put in data about another dog?Y/N');
    : Readln(kom);
    CASE kom OF
    'Y','y': BEGIN
    New(Temp^.next); { Create a new record beyond the last }
    Temp^.Next^.Next := nil;
    Write('Name?'); Readln(temp^.next^.namn);
    Write('Race?'); Readln(temp^.next^.ras);
    Write('Age?');Readln(temp^.next^.age);
    Write('Weight?'); Readln(temp^.next^.vikt);
    Temp := Temp^.Next; { Update the last record }
    end;
    until kom in ['n','N']; { End the loop }
    : Write('Do you want to write the register? Y/N:');
    : Readln(kom);
    : Case kom of
    : 'Y','y': BEGIN
    Temp := First; { Set an index-pointer to the first }
    repeat
    Writeln(Temp^.namn:5, ':', Temp^.ras:5, ':', Temp^.age:2, ':', Temp^.vikt); { write the current record }
    Temp := Temp^.Next; { move to the next record }
    until Temp=nil { loop until the end of the list }
    END;
    : 'N','n': Writeln('Bye');
    : Otherwise Writeln('Wrong kommando. Bye!');
    : END;
    : END.
    [/code]
    This code takes the "First"-pointer to be the head of the list. If you change this pointer, you will lose the entire list. The "Temp"-pointer is in the input loop the last record in the list, and the "Temp^.Next" is the record to be added to the list. In the output loop it is an index to the current record.
  • Poppe25Poppe25 Member Posts: 17
    : : I would be very grateful if someone could help me out with this one.
    : : I've a program were the user should put in data about dogs, and then be able to write them out on the screen.
    : :
    : : PROGRAM inlu5(Input, Output);
    : : TYPE String_15=packed ARRAY[1..15] of CHAR;
    : :
    : : hundpekare =^hundtyp;
    : :
    : : hundtyp=record
    : : namn : String_15;
    : : ras : String_15;
    : : age : Integer;
    : : vikt : Integer;
    : : next : hundpekare;
    : : END;
    : :
    : :
    : : VAR first,ny,temp : hundpekare;
    : : continue : Boolean;
    : : kom : Char;
    : : i,antal : Integer;
    : :
    : : BEGIN
    : : Writeln('Welcome to dogprogram!');
    : :
    : : new(first);
    : : first^.next:=NIL; {pekaren nollstlls}
    : : Write('Name of dog?'); Readln(first^.namn);
    : : Write('Race of dog?'); Readln(first^.ras);
    : : Write('Age of dog?');Readln(first^.age);
    : : Write('Weight of dog?'); Readln(first^.vikt);
    : :
    : : continue:=true;
    : : Repeat
    : : BEGIN
    : : Write('Do you want to put in data about another dog?Y/N');
    : : Readln(kom);
    : : CASE kom OF
    : : 'Y','y': BEGIN
    : :
    : : new(temp);
    : : temp:=first;
    : : Writeln(first^.namn:5,':',first^.ras:5,':',first^.age:2,' first^.'); Writeln(temp^.namn:5,':',temp^.ras:5,':',temp^.age:2,' temp^.');
    : :
    : : repeat
    : : BEGIN
    : : Writeln('Loop!');
    : : temp:=temp^.next;
    : : END;
    : : until (temp^.next=NIL);
    : :
    : : Write('Name?'); Readln(temp^.next^.namn);
    : : Write('Race?'); Readln(temp^.next^.ras);
    : : Write('Age?');Readln(temp^.next^.age);
    : : Write('Weight?'); Readln(temp^.next^.vikt);
    : : temp:=NIL;
    : : END;
    : : 'N','n': continue:=false;
    : : Otherwise
    : : BEGIN
    : : Writeln('Wrong kommando, try again!');
    : : continue:=true;
    : : END;
    : : END;
    : : END;
    : : Until NOT continue;
    : :
    : : Writeln(antal);
    : : Write('Do you want to write the register? Y/N:');
    : : Readln(kom);
    : : Case kom of
    : : 'Y','y': BEGIN
    : : { I dont know how to make this correct}
    : : END;
    : : 'N','n': Writeln('Bye');
    : : Otherwise Writeln('Wrong kommando. Bye!');
    : : END;
    : : END.
    : :
    : :
    : Here is a much easier and workable code to ask the user for a certain record:
    : [code]
    : : PROGRAM inlu5(Input, Output);
    : : TYPE String_15=packed ARRAY[1..15] of CHAR;
    : :
    : : hundpekare =^hundtyp;
    : :
    : : hundtyp=record
    : : namn : String_15;
    : : ras : String_15;
    : : age : Integer;
    : : vikt : Integer;
    : : next : hundpekare;
    : : END;
    : :
    : :
    : : VAR first,ny,temp : hundpekare;
    : : continue : Boolean;
    : : kom : Char;
    : : i,antal : Integer;
    : :
    : : BEGIN
    : : Writeln('Welcome to dogprogram!');
    : :
    : : new(first);
    : : first^.next:=NIL; {pekaren nollstlls}
    : : Write('Name of dog?'); Readln(first^.namn);
    : : Write('Race of dog?'); Readln(first^.ras);
    : : Write('Age of dog?');Readln(first^.age);
    : : Write('Weight of dog?'); Readln(first^.vikt);
    : Temp := First; { Get the "last" valid record }
    : Repeat
    : : Write('Do you want to put in data about another dog?Y/N');
    : : Readln(kom);
    : CASE kom OF
    : 'Y','y': BEGIN
    : New(Temp^.next); { Create a new record beyond the last }
    : Temp^.Next^.Next := nil;
    : Write('Name?'); Readln(temp^.next^.namn);
    : Write('Race?'); Readln(temp^.next^.ras);
    : Write('Age?');Readln(temp^.next^.age);
    : Write('Weight?'); Readln(temp^.next^.vikt);
    : Temp := Temp^.Next; { Update the last record }
    : end;
    : until kom in ['n','N']; { End the loop }
    : : Write('Do you want to write the register? Y/N:');
    : : Readln(kom);
    : : Case kom of
    : : 'Y','y': BEGIN
    : Temp := First; { Set an index-pointer to the first }
    : repeat
    : Writeln(Temp^.namn:5, ':', Temp^.ras:5, ':', Temp^.age:2, ':', Temp^.vikt); { write the current record }
    : Temp := Temp^.Next; { move to the next record }
    : until Temp=nil { loop until the end of the list }
    : END;
    : : 'N','n': Writeln('Bye');
    : : Otherwise Writeln('Wrong kommando. Bye!');
    : : END;
    : : END.
    : [/code]
    : This code takes the "First"-pointer to be the head of the list. If you change this pointer, you will lose the entire list. The "Temp"-pointer is in the input loop the last record in the list, and the "Temp^.Next" is the record to be added to the list. In the output loop it is an index to the current record.
    :

    Many Thanx!
  • Andre YoungAndre Young USAMember Posts: 0

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