#include <iostream>
#include <string>
using namespace std;
 
int main(){
	string s="Dog goes woof";
	cout<<"Довжина рядка: "<<s.length()<<endl;
 
	s.append(", \nCat goes meow");
	cout<<s<<endl;
 
	cout<<"Перший символ: "<<s.at(0)<<endl<<"Останній символ: "<<s.at(s.size()-1)<<endl;
 
	size_t positionCat=s.find("Cat");
	cout<<"Позиція 'Cat': "<<positionCat<<endl;
 
	size_t positionWoof=s.find("woof");
	string sound=s.substr(positionWoof,4);
	cout<<"Dog's sound: "<<sound<<endl;
 
	size_t positionDog=s.find("Dog");
	s.replace(positionDog,3,"Fox");
	cout<<s<<endl;
 
	s.insert(positionWoof,"loud ");
	cout<<s<<endl;
 
 
	if(positionCat != string::npos)s.erase(positionCat-2);
	cout<<s;    
 
	string chorus="Ring-ding-ding-ding-dingeringeding!";
	if(s.compare(chorus)==0)cout<<"Рядки однакові"<<endl;
	else cout<<"Рядки різні"<<endl;
 
	s.clear();
	cout<<"Рядок очишений? "<<(s.empty()?"Так":"Ні");
 
}
 

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