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#include <bits/stdc++.h>
using namespace std;
string st;
int d,i,dem;
int main()
{
freopen("xau.inp","r",stdin);
freopen("xau.out","w",stdout);
cin>>st;
d=st.length();
dem=0;
for (i=0; i<=d-1; i++)
if (st[i]=='a') dem++;
cout<<dem;
return 0;
}
Bài 1:
Program HOC24;
const fi='in.txt';
fo='out.txt';
var f: text;
i,n: integer;
t: longint;
procedure ip;
begin
assign(f,fi);
reset(f);
read(f,n);
close(f);
end;
procedure out;
begin
assign(f,fo);
rewrite(f);
t:=1;
for i:=1 to n do t:=t*i;
write(f,t);
close(f);
end;
begin
ip;
out;
end.
Bài 2:
Program HOC24;
const fi='in.txt';
fo='out.txt';
var f: text;
i: byte;
a: array[1..4] of string;
procedure ip;
begin
assign(f,fi);
reset(f);
for i:=1 to 4 do readln(f,a[i]);
close(f);
end;
procedure out;
begin
assign(f,fo);
rewrite(f);
for i:=1 to 4 do writeln(f,a[i]);
close(f);
end;
begin
ip;
out;
end.
1:
const fi='inp.txt';
fo='out.txt';
var n,i:integer;
s:real;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,n);
s:=1;
for i:=1 to n do
s:=s*i;
writeln(f2,s:4:2);
close(f1);
close(f2);
end.
const fi='mang.txt';
fo='tong.txt';
var f1,f2:text;
a:array[1..100]of integer;
n,i,t:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewriteln(f2);
n:=0;
while not eof(f1) do
begin
inc(n);
read(f1,a[n]);
end;
t:=0;
for i:=1 to n do
t:=t+a[i];
writeln(f2,t);
close(f1);
close(f2);
end.
const fi='hinhtron.inp';
fo='hinhtron.out';
var f1,f2:text;
a:array[1..100]of real;
i,n:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
n:=0;
while not eof(f1) do
begin
n:=n+1;
read(f1,a[n]);
end;
for i:=1 to n do
writeln(f2,'Hinh tron thu ',i,': Chu vi la ',(2*a[n]*pi):4:2,' va Dien tich la: ',a[n]*a[n]*pi:4:2);
close(f1);
close(f2);
end.
with open('XAU.INP', 'r') as input_file, open('XAU.OUT', 'w') as output_file:
for line in input_file:
length = len(line.strip())
output_file.write(f'{length}\n')