I just started learning Pascal and have issue.
Need to create a program that outputs the following result:
Input real number and press enter!: 4
****
***
**
*
I've come this far, but not figure out what to do next.
program project1;
var
i, x:byte;
y:char;
begin
write('Ievadiet veselu skaitli: ');
readln(x);
y:='*';
for i:=x downto 1 do writeln(y:3);
readln;
end.
Two loops do have to be involved, but breaking out that inner loop functionality into a separate procedure can make it much easier to understand what's going on.
We can also declare y as const.
program project1;
const
y = '*';
var
i, x : byte;
procedure writeln_n_times(x : char; n : byte);
var
i : byte;
begin
for i := 1 to n do
write(x);
writeln();
end;
begin
write('Ievadiet veselu skaitli: ');
readln(x);
for i := x downto 1 do
writeln_n_times(y, i);
end.
use two loops:
program project1;
var
i, j,x:byte;
y:char;
begin
write('Ievadiet veselu skaitli: ');
readln(x);
y:='*';
for i:=x downto 1 do
begin
for j:=i-1 downto 1 do
begin
write(y);
end;
writeln();
end;
end.
output:
Ievadiet veselu skaitli: 7
******
*****
****
***
**
*
In this program when I try to put the code blocks [1] and [2] in procedures they don't work properly when calling them, and when I keep them in the main program only the first one works properly and the second doesn't and when I comment out the first one the second one works as it's supposed...can you please spot the error, I think it's with getting the files names from the user cause when I choose the file's name it works properly
program Linked_lists_files;
type
Node = ^T;
T = record
num : integer;
next : Node;
End;
var
File1 : Text;
N, i, j, cmp, y, x, Num, matrixvalue : integer;
Head, Tail, Head2, Tail2, Head3, Tail3 : Node;
s : string;
matrix : array [1..20, 1..20] of Integer;
// procedures
// [1]
Procedure fillFile();
Begin
write('Input file name to create : ');
readln(s);
assign(File1,s);
rewrite(File1);
Repeat
write('Enter a number : ');
readln(N);
if (N>=0) then
writeln(File1, N);
Until (N<0);
close(File1);
End;
// [2]
Procedure GetFromFile();
Begin
cmp := 0;
write('Enter file name to read from : ');
readln(s);
assign(File1, s);
reset(File1);
while not eof(File1) Do
Begin
readln(File1, N);
if (Head = Nil) then
Begin
new(Head);
Tail := Head;
End
Else
Begin
new(Tail^.next);
Tail := Tail^.next;
End;
Tail^.num := N;
Tail^.next := Nil;
cmp := cmp + 1;
End;
Close(File1);
Write('Elements of the list : ');
Tail := Head;
if (Head<>nil) then
Begin
while(Tail <> nil) Do
Begin
write('[',Tail^.num,']', ' ');
Tail := Tail^.next;
End;
End
Else
Writeln('[!] The list is empty');
writeln;
writeln('Number of elements in the list : ', cmp);
End;
// [3]
Procedure SaveFromFile();
Begin
Head := Nil;
write('Enter file name to read from : '); readln(s);
writeln('[+] Fill in your list');
Repeat
write('+ Enter an integer : ');
read(y);
if (y>=0) then
Begin
if (Head = Nil) then
Begin
new(Head);
Tail := Head;
End
Else
Begin
new(Tail^.next);
Tail := Tail^.next;
End;
Tail^.num := y;
Tail^.next := Nil;
End;
Until y<0;
assign(File1, s);
rewrite(File1);
Tail := Head;
while(Tail <> nil) Do
Begin
Num := Tail^.num;
Tail := Tail^.next;
Writeln(File1, Num);
End;
Close(File1);
Writeln('[+] Elements of the lists have been successfully added to the new file');
End;
// [4]
Procedure SquareMatrix();
Begin
cmp := 0;
x := 0;
writeln('[+] Fill in your list');
Repeat
write('+ Enter an integer : ');
read(y);
if (y>=0) then
Begin
if (Head3 = Nil) then
Begin
new(Head3);
Tail3 := Head3;
End
Else
Begin
new(Tail3^.next);
Tail3 := Tail3^.next;
End;
Tail3^.num := y;
Tail3^.next := Nil;
cmp := cmp + 1;
End;
Until y<0;
while (cmp<>1) Do
Begin
if (cmp mod 2 <> 0) and (cmp <> 1) then
x := x + 1;
cmp := cmp div 2;
End;
if (x>0) then
writeln('[-] False')
Else
writeln('[+]True');
End;
// [5]
Procedure ElementsOfSM();
Begin
cmp := 0;
x := 0;
writeln('[+] Fill in your list');
Repeat
write('+ Enter an integer : ');
read(y);
if (y>=0) then
Begin
if (Head = Nil) then
Begin
new(Head);
Tail := Head;
End
Else
Begin
new(Tail^.next);
Tail := Tail^.next;
End;
Tail^.num := y;
Tail^.next := Nil;
cmp := cmp + 1;
End;
Until y<0;
Tail := Head;
i := 1;
j := 1;
while(Tail <> nil) Do
Begin
matrixvalue := Tail^.num;
matrix[i,j] := matrixvalue;
Tail := Tail^.next;
j := j + 1;
if (j = sqrt(cmp)+1) then
Begin
i := i + 1;
j := 1;
End;
End;
for i:=1 to cmp Do
for j:=1 to cmp Do
Begin
if (matrix[i,j]<>0) then
writeln('[',matrix[i,j],']',' : ','[',i,',',j,']');
End;
End;
// [6]
Procedure Element();
Begin
write('Enter the number of the line : ');
read(i);
write('Enter the number of the column : ');
read(j);
write('The element corresponding to ','[',i,',',j,'] is : ','[',matrix[i,j],']');
writeln;
End;
// [7]
Procedure WriteP();
Begin
write('Enter the number of the line : ');
read(i);
write('Enter the number of the column : ');
read(j);
write('Enter the value you want to pass in : ');
read(N);
matrix[i,j] := N;
writeln('The new matrix');
for i:=1 to cmp Do
for j:=1 to cmp Do
Begin
if (matrix[i,j]<>0) then
writeln('[',matrix[i,j],']',' : ','[',i,',',j,']');
End;
writeln;
End;
// [8]
Procedure Content();
Begin
write('Enter the number of the line : ');
read(i);
write('Enter the number of the column : ');
read(j);
writeln('The value stored inn this cell is : ','[', matrix[i,j],']');
End;
// Start of main program
Begin
Head := Nil;
Repeat
writeln('*********** MENU ***********');
writeln('[1] fillFile');
writeln('[2] GetFromFile');
writeln('[3] SaveFromFile');
writeln('[4] SquareMatrix');
writeln('[5] ElementsOfSM');
writeln('[6] Element');
writeln('[7] WriteP');
writeln('[8] Content');
writeln('*********** End ***********');
write('Choose one : ');
read(N);
case N of
1 : fillFile();
2 : GetFromFile();
3 : SaveFromFile();
4 : SquareMatrix();
5 : ElementsOfSM();
6 : Element();
7 : WriteP();
8 : Content();
End;
Until (N<>1) and (N<>2) and (N<>3) and (N<>4) and (N<>5) and (N<>6) and (N<>7) and (N<>8) and (N<>9);
End.
The problem you describe is being caused by the known behaviour of the Read statement; basically, the second (and subsequent) times you call it, it returns immediately, without waiting for any keyboard input and without reading anything.
This happen because FPC is closely based on Object Pacal in the commercial Delphi development package, and in Delphi's case, this is the officially documented behaviour.
From the Delphi (v7) online help:
Delphi syntax:
Text files:
procedure Read( [ var F: Text; ] V1 [, V2,...,Vn ] );
Description
The Read procedure can be used in Delphi code in the following ways.
[...]
With a type string variable:
Read reads all characters up to, but not including, the next end-of-line
marker or until Eof(F) becomes true; it does not skip to the next line after reading. If the resulting string is longer than the maximum length of the string variable, it is truncated.
After the first Read, each subsequent Read sees the end-of-line marker and returns a zero-length string (emphasis added).
Use multiple Readln calls to read successive string values.
Fortunately, the solution is simple, use readln, instead of read, as in
readln(s);
Update Make sure you replace all instances of read by readln, as you have left a number of them unchanged, as #TomBrunberg has commented.
After that, run your code again and select 1 from the menu and you will find that fillFile executes, but the program terminates on the until ... line. And that's because it is a very bad idea to use the same global variable, in this case N for several different purposes throughout the program. So, you should edit your code further (and carefully) so that as far as possible it only uses global variables for global purposes. Turn all all the other variables into local variables, preferably with different names than the global ones. If after that you are still having problems, submit a new question focused on that.
can you say to me, where is the error. I wanna write in console the content of the a[i] in every for run. The output could be 6 digits. There is compiler Alert:
/usr/bin/ld.bfd: warning: link.res contains output sections; did you forget -T?
...Program finished with exit code 0
program Hello;
type aha = array [1..6] of integer;
var
a: aha;
n,x,i: integer;
begin
a[1]:=2;
a[2]:=6;
a[3]:=4;
a[4]:=2;
a[5]:=4;
a[6]:=3;
n:=6;
x:=a[1];
for i:=2 to n do
begin
{
if (a[i-1]>= x) then
begin
a[i]:=a[i] - x div 2;
end;
else
begin
a[i]:=a[i] + x;
x:= x + mod x(a[i] + 1);
end;
writeln (a[i]);
}
end;
end.
I got this error when trying to compile.
left side cannot be assign to, ./number 21,22 in pastebin
here is my code
Program urut;
Uses Wincrt;
Const N = 5;
data: Array [1..N] Of Integer = (2,4,5,3,1);
Var
j,k,temp : Integer;
Begin
Clrscr;
Writeln ('Data sebelum diurutkan');
For j:=1 To N Do
Begin
Writeln('data[' ,j, ']= ',data [j]);
End;
For j:=1 To N-1 Do
Begin
For k :=N Downto j+1 Do
Begin
If data[k] < data[k-1] Then
Begin
temp := data[k];
data[k] := data[k-1]; //left side cannot be assigned to
data[k-1] := temp; //left side cannot be assigned to
End;
End;
End;
Writeln;
Writeln ('Data setelah diurutkan ');
For j:=1 To N Do
Begin
Writeln ('data[' ,j, '] = ',data[j]);
End;
Writeln;
End.
sorry for uncorrectly pattern post
, thank you so much.
Like tom Tom Brunberg says, my array is const, it can't be changed. Therefore I need to remove that const.
So it should be
data: Array [1..5] Of Integer = (value);
without const, and put it under var with another variable
My question is how can I read some number of integers that user enters on standard input, and place them in array.However I don't how many numbers user will enter and i can't ask him that? User enters numbers in one line.
Okay i have just one more answer i would like to add.Thanks all for your help this is code written based on suggestions.I added a line for writting array backwards just for you can see that it has readed well.
program backo;
var niz:array [1..100] of integer;
n, i:integer;
begin
i:=1;
writeln('enter elements of array');
read(niz[i]);
while not eoln do
begin
i:=i+1;
read(niz[i]);
end;
for n:=i downto 1 do
writeln(niz[n]);
end.
Ok, based on comments there is three ways demonstrated:
program readmultiint;
{$mode objfpc}{$H+}
uses
StrUtils;
const
CMaxValues = 3;
var
s: string;
darr: array of Integer;
sarr: array [0..CMaxValues-1] of Integer;
i, cnt: Integer;
begin
// Dynamic array using WordCount
Writeln('Enter values:');
Readln(s);
cnt := WordCount(s, StdWordDelims);
SetLength(darr, cnt); // Allocate room for values
for i := 0 to cnt - 1 do
Val(ExtractWord(i + 1, s, StdWordDelims), darr[i]);
for i in darr do
Writeln(i);
// Dynamic array usin EOLN
SetLength(darr, 0);
Writeln('Enter values:');
while not eoln do
begin
SetLength(darr, Length(darr) + 1); // Expand array for next value
Read(darr[High(darr)]);
end;
Readln; // Read <Enter> itself
for i in darr do
Writeln(i);
// Static array
cnt := 0;
Writeln('Enter values:');
while (not eoln) and (cnt < CMaxValues) do // Reads not more then CMaxValues values
begin
Read(sarr[cnt]);
Inc(cnt);
end;
Readln; // Read <Enter> itself
for i := 0 to cnt-1 do
Writeln(sarr[i]);
end.
Feel free to use one of them or provide your own :)
PS: Some readings:
Dynamic arrays
Val procedure
for-in loop