I am supposed to create a Pascal program that obtains 4 inputs from user and averages them. The program should enforce all inputs to be between 0 and 100, inclusive. This is for class, but more importantly I have more programs and I need to understand why I suck at this. Not looking for an easy answer. I appreciate any help.

ERROR messages
pro4.pas(15,20) Warning: Variable NUM does not seem to be initialized
pro4.pas(25) Fatal: Unexpected end of file


PROGRAM pro4(input,output);

VAR

tot, num, i: integer; ave: real;

BEGIN

ave:= tot/4;

for i:= 1 to 4 do begin

writeln (output, 'Enter integer');

readln (input, num + tot);

while(num>=0) and (num<=100) do begin

writeln(output, 'Get another integer');

readln(input, ave);

end ;

See comments in code:

program pro4(input, output);
var
   tot, num, i: integer;
   ave: real;
begin
   ave := tot / 4; { tot hasn't been initialized yet. Can't do this here. }

   for i := 1 to 4 do
   begin
      writeln(output, 'Enter integer');
      readln(input, num + tot); { You can't perform math operation here. }
      {
         The following loop will be keep repeating until the user
         enters a value outside the valid range. I don't think
         that's what you want.
      }
      while (num >= 0) and (num <= 100) do
      begin
         writeln(output, 'Get another integer');
         readln(input, ave); { why are you reading into ave? }
      end;
   end; { for loop } { This was missing. }
end. { program } { This was missing. }

Revised code (compiles with FreePascal / WinXP):

program Program4;
uses
   SysUtils;
var
   Total: Integer;
   Number: Integer;
   I: Integer;
   Average: Double;
begin
   { Initialize Total to zero. }
   Total := 0;

   { Get four integer values from the user. }
   for I := 1 to 4 do
   begin
      Write('Enter an integer value between 0 and 100 (inclusive): ');
      ReadLn(Number);
      while (Number < 0) or (Number > 100) do
      begin
           WriteLn;
           WriteLn('Error: Number out of range. Please re-enter.');
           WriteLn;
           Write('Enter an integer value between 0 and 100 (inclusive): ');
           ReadLn(Number);
      end;
      Total := Total + Number;
   end;

   { Calculate the average. }
   Average := Total / 4.0;

   { Display the average. }
   WriteLn;
   WriteLn('The average is: ' + FloatToStr(Average));
   WriteLn;
end.

Thank you both very much. I managed to put everything together, and met with my professor for a little more understanding. I really appreciate each of you being helpful instead of bashing me for not being smart enough to creat a simple program.

ehh
i'm in coding a go game on pascal. this is the code as far
program IGOPascal;

uses
wincrt;

type
igo=0..3;

var
papan:array[1..15,1..15]of igo;
xt,yt:array[0..225]of integer;
tanda:array[1..4]of boolean;
a,b,x,y,i,j,pin:integer;

procedure cek_d1(xd:integer;yd:integer;pin:integer);
begin
case papan[xd,yd] of
0:exit;
1:cek_c(xd,yd,pin);
2:begin
tanda[j]:=true;
exit;
end;
end;

procedure cek_d2(xd:integer;yd:integer;pin:integer);
begin
case papan[xd,yd] of
0:exit;
2:cek_c(xd,yd,pin);
1:begin
tanda[j]:=true;
exit;
end;
end;
procedure cek_c(xc:integer;yc:integer;pin:integer);

begin
pin:=pin+1;
for j:=1 to 4 do
begin
case j of
2:begin
xt[pin]:=xc+1;
yt[pin]:=yc;
end;

1:begin
xt[pin]:=xc-1;
yt[pin]:=yc;
end;

4:begin
xt[pin]:=xc;
yt[pin]:=yc+1;
end;

3:begin
xt[pin]:=xc;
yt[pin]:=yc-1;
end;
end;
case papan[x,y] of
1:cek_d1(xt[0],xy[0]);
2:cek_d2(xt[0],xy[0]);
end;
end;
if tanda=true then
papan[xc,yc]:=3;
end;

procedure cek_b1(xb:integer;yb:integer);

begin
case papan[xb,yb] of
0:exit;
1:exit;
2:cek_c(xb,yb,0);
end;

procedure cek_b2(xb:integer;yb:integer);

begin
case papan[xb,yb] of
0:exit;
2:exit;
1:cek_c(xb,yb,0);
end;

procedure cek_igo(xa:integer;ya:integer);

begin
for i:=1 to 4 do
begin
case i of
1:begin
xt[0]:=xa+1;
yt[0]:=ya;
end;

2:begin
xt[0]:=xa-1;
yt[0]:=ya;
end;

3:begin
xt[0]:=xa;
yt[0]:=ya+1;
end;

4:begin
xt[0]:=xa;
yt[0]:=ya-1;
end;
end;
case papan[x,y] of
1:cek_b1(xt[0],xy[0]);
2:cek_b2(xt[0],xy[0]);
end;
end;
for i:=1 to 225 do
for j:=1 to 225 do
if papan[j,i]=3 then
papan[j,i]=0;

end;


begin
readln(x);
readln(y);
cek_igo(x,y);
end.


it use a multiple procedure
can someone help me?

Make a new thread as the intiial post was answered and this is not your thread. Post with code tags so your code is readable. As well as explain the problem you're having.

This article has been dead for over six months. Start a new discussion instead.