uses crt;

var st:string;

i,d:integer;

begin

clrscr;

readln(st);

d:=length(st);

for i:=1 to d do 

  if (st[i]='a') or (st[i]='A') then st[i]:='b'

writeln(st);

readln;

end.

1:

#include <bits/stdc++.h>

using namespace std;

long long a,b;

int main()

{

cin>>a>>b;

cout<<a+b;

return 0;

}

2:

#include <bits/stdc++.h>

using namespace std;

double s,r;

int main()

{

cin>>r;

s=r*r*pi;

cout<<fixed<<setprecision(2)<<s;

return 0;

}

Program HOC24;

var s: string;

i: byte;

begin

write('Nhap xau: '); readln(s);

for i:=1 to n do if not(s[i] in ['0'..'9']) then write(s[i]);

readln

end.

#include <bits/stdc++.h>

using namespace std;

int A[500],n,i,dem,dem1;

int main()

{

cin>>n;

for (int i=1; i<=n; i++) cin>>A[i];

for (int i=n; i>=1; i--) cout<<A[i]<<" ";

cout<<endl;

dem=0;

for (int i=1; i<=n; i++)

if (A[i]<10) dem++;

cout<<dem<<endl;

dem1=0;

for (int i=1; i<=n; i++)

if (A[i]>1)

{

bool kt=true;

for (int j=2; j*j<=A[i]; j++)

if (A[i]%j==0) kt=false;

if (kt==true) dem1++;

}

cout<<dem1;

return 0;

}

đitf

Bài 2: 

#include <bits/stdc++.h>

using namespace std;

string st;

int d;

int main()

{

getline(cin,st);

d=st.length();

cout<<d;

return 0;

}

Bài 1:

Var so,i,n,dem:integer;

Begin

Write('Nhap so luong so n = ');readln(n);

For i:=1 to n do

Begin

Write('Nhap so thu ',i);readln(so);

If so mod 2 = 0 then dem:=dem+1;

End;

Write('Co ',dem,' so chan');

Readln;

End.

Bài 2:

Var st:string;

Begin

Write('Nhap vao xau ki tu ');readln(st);

Write(' Xau vua nhap co do dai la ',length(st));

Readln;

End.

program BaiTap;

var

      A: array[1..150] of integer;

      N, i, sum: integer;

begin

      write('Nhap so phan tu cua day A (N <= 150): ');

      readln(N);

      for i := 1 to N do

      begin

            write('Nhap phan tu thu ', i, ': ');

            readln(A[i]);

      end;

      writeln('Day so vua nhap la:');

      for i := 1 to N do

            write(A[i], ' ');

      writeln;

      sum := 0;

      for i := 1 to N do

            if A[i] mod 2 = 0 then

                  sum := sum + A[i];

      writeln('Tong cac phan tu chan trong day la: ', sum);

      readln;

end.