bai 4 Su dung bien trong chuong trinh

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
 !"#$%&'
($)*+,!
-.
/%012345467.
89:454;<
/67*+,!=3>*+,!".
89:?5@;<



A-B.C-*+,!*D
!7.

E*7.
?←FF54F
@←?GH
I←?G4
100 50
3
+
100 50
5
+

BJ!*$
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A%!*$!$K7.
5J!*$

<
5J!*$
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,!
A-
C$ .
5VarL% !,!%!*$M
5 m,n* %"6:99;M
5S, dientich* %&:9!;M
5thong_bao%=N:O;


E*%!*$.
VarP!O*Q.P%6
R
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(!O*7
R
!"S6M*6
*!TUV"
 J  6
R
W  7
R
 $ * % V !"

%6
R
$W+X!
BJ!*$


HYZ$'

[\OZ!1&*!$*.
5Khai báo3%$ M
5Nhập giá trị$$]**+$M
5Tính tóan>*+,!

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
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
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J6
R
*$
W1>%
%*7
R
*+7>M*+
^,!O_7U
`*+,! !"#a
U%W7$$'




HYZ$'
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ENOZ.
5b*+$L-7
Readln (tên biến);
5b**+$
Tên biến:= Biểu thức cần gán giá trị cho biến


Lệnh Ý nghĩa
X:=12; `**+O\B$>X
X:=Y; `**+c$>Y$>
X
X:=(a+b)/2; C&2$*-3!*
+d7$!>abJ01*$
>X
X:=X+1; Ce*+,!>X673'+M%01
*TaX
HYZ$'


fgd
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gda *+%#$
O\0*&'
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gd1**+!"%%!*$

E*%!*$d
Const tên hằng = giá trị của hằng
A-.
hC$ .
constL% !%!*$d
E*dpiMbankinh**+'D
HfB


d*a]
6`*+,!
    !" #M i * + ,!
d   "6$O\0*
&'
Bd1%!*$>
%OZ
`g/jgk


A
A
Var tb: real;
B
B
Var 4hs: integer;
D
D
Var R= 30
C
C

Const x: real
Trong Pascal, khai báo nào sau đây là đúng ?