string str{"Time is an illusion. Lunchtime doubly so."};

string fstr = "doubly";

// replace char

replace(str.begin(),str.end(),'T','X');

cout << str << endl;

// find and replace char

auto itr = find(str.begin(), str.end(), 'X');

(*itr) = 'Y';

cout << str << endl;

// replace substr with regex

string res = regex_replace(str,regex("illusion"),"orca");

cout << res << endl;

// reverse

reverse(str.begin(),str.end());

cout << str << endl;

// copy

string str2;

str2 = str;

cout << str2 << endl;

// access string chars

for(int i = 0; i < str.length(); ++i){

if(i%2 == 0)

str.at(i) = 'x';

}

cout << str << endl;

// first and last char

cout << str.front() << " " << str.back() << endl;

// append

str = str + " wombat";

cout << str << endl;

// str length

str.clear();

str = "four five six seven eight nine 10 11 12";

cout << str.length() << endl;

// test and clear

if(!str.empty())

str.clear();

cout << str << endl;

str += "1 2 3 4 five six seven";

// insert behind

string find_str = "seven";

str.insert(str.find(find_str)+find_str.length()," wombats");

cout << str << endl;

// swap

string s1 = "foo";

string s2 = "bar";

swap(s1,s2);

cout << s2 << endl;

// replace all occurrences

s1 = "foo foo";

find_str = "foo";

int i;

while((i = s1.find(find_str)) != string::npos){

s1.replace(i,find_str.length(),"bar");

}

cout << s1 << endl;

// substr

s1 += "bar baz";

find_str = "baz";

string subs = s1.substr(s1.find(find_str),find_str.length());

cout << subs << endl;

// split string

string split_str = "1|2|3|4|5";

string delim = "|";

string token;

int pos;

while((pos = split_str.find(delim)) != string::npos){

token = split_str.substr(0,pos);

split_str.erase(0,pos + delim.length());

cout << token << " ";

}

cout << split_str << endl;

int k = 77;

cout << to_string(k) + " dragons\n";

return 0;