Bài 5: Khai báo biến

program bai_tap;
uses crt;
var n,i,dem1,dem2,s1,s2:byte;
tb1,tb2:real;
begin
clrscr;
write('nhap n: ');{nhap gia tri cua n VD: n= 10}
readln(n);
for i:= 1 to n do
if i mod 2 = 0 then {so chan la so chia het cho 2 hay chia 2 du 0}
begin
dem1:=dem1+1; {tinh xem co bao nhieu so mod 2 = 0}
s1:=s1+i; {tinh tong cac so chan}
end
else { neu i mod 2 khac 0 thi...(so le)}
begin
dem2:=dem2+1;
s2:=s2+i;
end;
tb1:= s1/dem1; {tinh trung binh cong}
tb2:= s2/dem2;
writeln('trung binh cong cac so chan: ',tb1:4:2); {xuat ra trung binh cong}
writeln('trung binh cong cac so le: ',tb2:4:2);
readln
end.

uses crt;

var n,i,t:integer;

begin

clrscr;

write('Nhap n='); readln(n);

t:=0;

for i:=1 to n do 

  if i mod 2=0 then t:=t+i;

writeln('Tong cac so chan trong khoang tu 1 toi ',n,' la: ',t);

readln;

end.

var a,b,s,p:integer;beginwrite('a=');readln(a);write('b=');readln(b);s:=a+b;p:=a*b;writeln(' Tong la: ',s);writeln(' Tich la: ',p);if (s mod 5=0) and (s mod 9=0) then writeln(' Tong chia het cho 5 va 9 ')else writeln(' Tong k chia het cho 5 va 9 ');if (p mod 5=0) and (p mod 9=0) then writeln(' Tich chia het cho 5 va 9')else writeln(' Tich k chia het cho 5 va 9');readln;end.

var a,b,s,p:integer;

begin

write('a=');readln(a);

write('b=');readln(b);

s:=a+b;

p:=a*b;

writeln(' Tong la: ',s);

writeln(' Tich la: ',p);

if (s mod 5=0) and (s mod 9=0) then writeln(' Tong chia het cho 5 va 9 ')

else writeln(' Tong k chia het cho 5 va 9 ');

if (p mod 5=0) and (p mod 9=0) then writeln(' Tich chia het cho 5 va 9')

else writeln(' Tich k chia het cho 5 va 9');

readln;

end.

a ở đây là bán kính hay đường kính bro

Uses crt;

Var a,b: real;

Begin

Clrscr;

Writeln('Nhap a,b');

Realn(a,b);

If (a>0) and (b>0) then writeln('Tich cua a,b la:', a*b)

else writeln('Yeu cau nhap lai');

Readln;

End.

var n,i,k,d: integer;

a:array[1..52] of integer;

begin

write('Nhap so N: '); readln(n);

for i:=1 to n do

begin

write('a[',i,'] = '); readln(a[i]);

end;

write('Nhap so k: '); readln(k);

d:=0;

for i:=1 to n do

if a[i] mod k = 0 then d:=d+1;

writeln('Co ',d,' so chia het cho ',k,' trong day');

if d mod 2 = 0 then writeln('Chan') else writeln('Le');

end.

uses crt;

var a:array[1..52]of integer;

i,n,k,dem:integer;

begin

clrscr;

repeat

write('Nhap n='); readln(n);

until (0<n) and (n<=52);

for i:=1 to n do 

  begin

write('A[',i,']='); readln(a[i]);

end;

write('Nhap k='); readln(k);

dem:=0;

for i:=1 to n do  

  if a[i] mod k=0 then inc(dem);

writeln('Trong day co ',dem,' so chia het cho ',k);

if dem mod 2=0 then writeln('So luong so chia het cho ',k,' la so chan')

else writeln('So luong so chia het cho ',k,' la so le');

readln;

end.

Chọn B

Var r: real; {khai báo 1 biến theo kiểu thực}

s: string; {khai báo 1 biến theo kiểu thực}