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#include <bits/stdc++.h>
using namespace std;
long long n,i,t;
int main()
{
freopen("dulieu.txt","r",stdin);
freopen("uot.txt","w",stdout);
cin>>n;
t=0;
for (i=1; i<=n; i++)
if (i%2==0) t+=i;
cout<<t;
return 0;
}
Bài 1:
const fi='so.inp';
fo='so.out';
var f1,f2:text;
a:array[1..100]of integer;
dem,i,t:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
dem:=0;
while not eof(f1) do
begin
inc(dem);
readln(f1,a[dem]);
end;
writeln(f2,'Cac so nguyen am la: ');
for i:=1 to dem do
if a[i]<0 then write(f2,a[i]:4);
writeln(f2);
t:=0;
for i:=1 to dem do
if (a[i] mod 5=0) and (a[i] mod 3=0) then t:=t+a[i];
writeln(f2,'Tong cac so chia het cho 3 va 5 la: ',t);
close(f1);
close(f2);
end.
Bài 2:
uses crt;
const fi='baitap.txt';
fo='kq.qut';
var f1,f2:text;
a:array[1..100]of integer;
dem,i,n:integer;
begin
clrscr;
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
n:=0;
while not eoln(f1) do
begin
inc(n);
read(f1,a[n]);
end;
dem:=0;
for i:=1 to n do
if a[i] mod 5=0 then dem:=dem+1;
writeln('So luong cac so chia het cho 5 la: ',dem);
for i:=1 to n do
if sqrt(a[i])=trunc(sqrt(a[i])) then write(f2,a[i]:4);
close(f1);
close(f2);
readln;
end.
a)
PROGRAM BAI1a;
VAR N, Tle, Tchan: integer;
BEGIN
Write ('Nhap N =');
Readln (N);
If (N mod 2) = 0 Then
Tle := N*((N - 2)/2 + 1)/2;
Tchan := (N + 2)*((N - 2)/2 + 1)/2;
If (N mod 2) = 1 Then
Tle := (N + 1)*((N-1)/2 +1)/2;
Tchan := (N + 1)*((N - 3)/2 + 1)/2;
WRITELN ('Sle =', Sle, 'Schan =', Schan);
READLN;
END.
Program HOC24;
const fi='DL.INP';
fo='DL.OUT';
var s: string;
d,i: byte;
f: text;
procedure ip;
begin
assign(f,fi);
reset(f);
read(f,s);
close(f);
end;
procedure out;
begin
assign(f,fo);
rewrite(f);
d:=0;
for i:=1 to length(s) do if s[i] in ['0'..'9'] then inc(d);
write(f,d);
close(f);
end;
begin
ip;
out;
end.
const fi='dl.inp';
fo='kq.out';
var f1,f2:text;
s:string;
d,i,dem:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,s);
d:=length(s);
dem:=0;
for i:=1 to d do
if s[i] in ['0'..'9'] then inc(dem);
writeln(dem);
readln;
end.
uses crt;
const fi='input.txt';
fo='output.txt';
var f1,f2:text;
a,b:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,a,b);
if (a=0) and (b=0) then writeln(f2,'Phuong trinh co vo so nghiem');
if (a<>0) then writeln(f2,-b/a:4:2);
if (a=0) and (b<>0) then writeln(f2,'Phuong trinh vo nghiem');
close(f1);
close(f2);
end.
uses crt;
const fi='dayso.txt';
fa='tong.txt';
fb='kq.txt';
var f1,f2,f3:text;
a:array[1..100]of integer;
n,i,t,kt,j:integer;
begin
clrscr;
assign(f1,fi); reset(f1);
assign(f2,fa); rewrite(f2);
assign(f3,fb); rewrite(f3);
n:=0;
while not eof(f1) do
begin
n:=n+1;
readln(f1,a[n]);
end;
{--------------------------cau-a--------------------------}
t:=0;
for i:=1 to n do
t:=t+a[i];
writeln(f2,'tong cua day so la: ',t);
{--------------------------cau-b--------------------------}
writeln(f3,'cac so chan trong day la: ');
for i:=1 to n do
if a[i] mod 2=0 then write(f3,a[i]:4);
writeln(f3);
writeln(f3,'cac so le trong day la: ');
for i:=1 to n do
if a[i] mod 2<>0 then write(f3,a[i]:4);
{--------------------------cau-c--------------------------}
writeln('cac so nguyen to trong day la: ');
for i:=1 to n do
if a[i]>1 then
begin
kt:=0;
for j:=2 to a[i]-1 do
if a[i] mod j=0 then kt:=1;
if kt=0 then write(a[i]:4);
end;
close(f1);
close(f2);
close(f3);
readln;
end.
Câu 2:
uses crt;
var a:array[1..100]of integer;
i,n,min,dem1,dem2,t1,t2:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
max:=a[1];
for i:=1 to n do
if max<a[i] then max:=a[i];
writeln('Gia tri lon nhat la: ',max);
dem1:=0;
dem2:=0;
t1:=0;
t2:=0;
for i:=1 to n do
begin
if a[i] mod 2=0 then
begin
inc(dem1);
t1:=t1+a[i];
end
else begin
inc(dem2);
t2:=t2+a[i];
end;
end;
writeln('So so chan la: ',dem1);
writeln('So so le la: ',dem2);
writeln('Tong cac so chan la: ',t1);
writeln('Tong cac so le la: ',t2);
readln;
end.
Câu 1:
const fi='dulieu.inp';
fo='ketqua.out';
var f1,f2:text;
m,n,t,i:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,m,n);
t:=0;
for i:=m to n do
if i mod 2=1 then t:=t+i;
writeln(f2,t);
close(f1);
close(f2);
end.
const fi='vao.inp';
fo='ra.out';
var n,i,s:integer;
f1,f2:text;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,n);
s:=0;
for i:=1 to n do
s:=s+i;
writeln(f2,s);
close(f1);
close(f2);
end.