Trở về đầu
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#include<iostream>
using namespace std;
int main() {
string s;
s = "Xin chao Viet Nam";
cout << s << endl;
cout << "Do dai xau s la: " << s.length() << endl;
int i;
for (i=0; i<s.length(); i++)
cout << s[i];
cout << endl;
s.erase(9, 5);
cout << s << endl;
s.insert(9, "Viet ");
cout << s << endl;
cout << s.substr(9, 4) << endl;
cout << s.find("Viet") << endl;
s.replace(9, 4, "deo Hai");
cout << s << endl;
}