append string to another string c 2b 2b

1// appending to string
2#include <iostream>
3#include <string>
4
5int main ()
6{
7  std::string str;
8  std::string str2="Writing ";
9  std::string str3="print 10 and then 5 more";
10
11  // used in the same order as described above:
12  str.append(str2);                       // "Writing "
13  str.append(str3,6,3);                   // "10 "
14  str.append("dots are cool",5);          // "dots "
15  str.append("here: ");                   // "here: "
16  str.append(10u,'.');                    // ".........."
17  str.append(str3.begin()+8,str3.end());  // " and then 5 more"
18  str.append<int>(5,0x2E);                // "....."
19
20  std::cout << str << '\n';
21  return 0;
22}

1// string::operator+=
2#include <iostream>
3#include <string>
4
5int main ()
6{
7  std::string name ("John");
8  std::string family ("Smith");
9  name += " K. ";         // c-string
10  name += family;         // string
11  name += '\n';           // character
12
13  std::cout << name;
14  return 0;
15}

1// appending to string
2#include <iostream>
3#include <string>
4
5int main ()
6{
7  // easy way
8  std::string str = "Hello";
9  std::string str2 = " World";
10  std::cout << str + str2 << std::endl;
11  return 0;
12}