©TCP-tryC++

#include <iostream>
#include <string>
using namespace std;

int main(void)
{
	string str1, str2, str3;
	
	str1.append("C++ Programming");
	str2.append("C++ Programming", 4, 7);
	str3.append(4, 'X');
	
	cout << str1 << endl;
	cout << str2 << endl;
	cout << str3;
	return 0;
}