Считать текст из файла и вывести только предложения, состоящие из заданного количества слов

#include <fstream.h>
#include <string.h>
#include <iostream.h>
#include <stdio.h>
 
int main()
{
int number, schetchik=0, predlogeniya, string, word;
 
ifstream fin("fail.txt", ios::in|ios::nocreate);
if(fin!)
{
cout<<"Oshibka otkritiya faila."<<endl;
return 1;
}
cout <<"Vvedite kolichestvo slov: ";
cin>>number;

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
using namespace std;
 
int getCountOfWords(const string & str)
{
int cnt=0;
for(int i=0; i<str.size(); i++)
{
if(
   str[i]==' '||//пробелы   
   str[i]=='.'||//окончания строк
   str[i]=='!'||//--
   str[i]=='?'//--
   )
cnt++;
}
return cnt;
}
 
int main()
{
const char* black_line="\n___________________\n";
const char* out_cstring = "String class. \
Strings are objects! That represent sequences of characters. \
The standard string class? \
Provides support. \
For such objects with an interface. \
Similar to that of a standard. \
Container of bytes, but! \
Adding features specifically. \
Designed. \
To operate. \
With. \
Strings of single-byte. \
Characters. \
The string. \
Class! \
Is an instantiation of! \
The basic_string class? \
Template that uses char. \
Continue (ie, bytes) as its character type. \
With its default char_traits. \
And allocator. \
Types (see basic_string for more info on the template). \
Note that this class handles. \
Bytes independently of the encoding. \
Used: If used to handle sequences. \
Of multi-byte or variable-length. \
Characters (such as UTF-8), all members. \
Of this class (such as length or size). \
As well as its iterators, will still. \
Operate in terms of bytes (not actual encoded characters).";
cout<<"out_cstring:"<<black_line<<out_cstring;
cout<<black_line;
std::string f = "bla-bla-bla!";
const char* filename = f.c_str();
 
ofstream out_file(filename, ios::out);
int i=0;
while(out_cstring[i])out_file<<out_cstring[i++];
out_file.close();
cout<<"file content:"<<black_line;
ifstream in_file(filename, ios::in);
string all_text="";
getline(in_file,all_text);
cout<<all_text<<endl<<black_line;
vector<string>strings;
string line_str="";
for(size_t i=0; i<all_text.size(); ++i)
{
    line_str+=all_text[i];
if(all_text[i]=='.' || all_text[i]=='!' || all_text[i]=='?')
{
if(line_str.size()>1)
{
strings.push_back(line_str);
line_str="";
++i;
}
}
}
cout<<"The string from file:"<<black_line;
cout<<all_text<<endl<<black_line;
cout<<"The lines from string:"<<black_line;
for(size_t i=0; i<strings.size(); ++i)
cout<<strings[i]<<endl;
cout << endl;
cout<<black_line;
int word_per_line=1;
cout<<"How many words do you wish to have per line? ";
cin>>word_per_line;
cout<<black_line;
for(size_t i=0; i<strings.size(); ++i)
{
if(word_per_line==getCountOfWords(strings[i]))cout<<strings[i]<<endl;
}
cout<<black_line;
    system("pause");
    return 0;
}

Otkroysia("Sim-Sim");