# include <iostream>
# include <fstream>
# include <string>
# include <sstream>
# include <algorithm>
# include <cctype>
void open_file ( const std::string &filename, std::string &content) {
std::ifstream infile (filename.c_str()) ;
std::stringstream buffer;
buffer << infile. rdbuf ();
content = buffer. str ();
}
void save_file ( const std::string &filename, const std::string &content) {
std::ofstream outfile (filename.c_str()) ;
outfile << content;
}
std::string find_and_replace ( const std::string &content, const std::string &search, const std::string &replace) {
std::string result (content) ;
size_t pos = 0 ;
while ((pos = result. find (search, pos)) != std::string::npos) {
result. replace (pos, search. length (), replace);
pos += replace. length ();
}
return result;
}
int count_words ( const std::string &content) {
std::stringstream ss (content) ;
std::string word;
int count = 0 ;
while (ss >> word) {
++count;
}
return count;
}
std::string capitalize_words ( const std::string &content) {
std::string result (content) ;
bool newWord = true ;
for ( size_t i = 0 ; i < result. size (); ++i) {
if (std:: isspace (result[i])) {
newWord = true ;
} else if (newWord) {
result[i] = std:: toupper (result[i]);
newWord = false ;
}
}
return result;
}
int main () {
std::string filename = "test.txt" ;
std::string content;
open_file (filename, content);
std::cout << "Original content:\n" << content << std::endl;
content = find_and_replace (content, "test" , "TEST" );
std::cout << "Content after find and replace:\n" << content << std::endl;
int word_count = count_words (content);
std::cout << "Word count: " << word_count << std::endl;
content = capitalize_words (content);
std::cout << "Content after capitalizing words:\n" << content << std::endl;
save_file ( "output.txt" , content);
return 0 ;
}