C++ Tutorial/string/string concatenation

Concatenate two strings

<source lang="cpp">#include <iostream>

1. include <string>

using namespace std; int main() {

 string str1("A");
 string str2("B");
 string str3("G");
 string str4;
 cout << "  str1: " << str1 << endl;
 cout << "  str2: " << str2 << endl;
 cout << "  str3: " << str3 << "\n\n";
 // Concatenate two strings.
 str4 = str1 + str3;
 cout << "str4 after begin assigned st1+str3: " << str4 << "\n\n";
 return 0;

}</source>

overloaded string concatenation operator

<source lang="cpp">#include <iostream> using std::cout; using std::endl;

1. include <string>

using std::string; int main() {

  string s1( "AA" );
  string s2( " AAB" );
  string s3;
  // 
  cout << "\n\ns1 += s2 yields s1 = ";
  s1 += s2; // test overloaded concatenation
  cout << s1;
  return 0;

}</source>

s1 += s2 yields s1 = AA AAB"

overloaded string concatenation operator with C-style string

<source lang="cpp">#include <iostream> using std::cout; using std::endl;

1. include <string>

using std::string; int main() {

  string s1( "AA" );
  string s2( " AAB" );
  string s3;
  // 
  cout << "\n\ns1 += \" to you\" yields" << endl;
  s1 += " to you";  
  cout << "s1 = " << s1 << "\n\n";
  return 0;

}</source>

s1 += " to you" yields
s1 = AA to you

Plus string together

<source lang="cpp">#include <iostream>

1. include <string>

using namespace std; int main() {

 string sentence, words[10];
 int pos = 0, old_pos = 0, nwords, i = 0;
 sentence = "Eskimos have 23 ways to ";
   sentence += "describe snow";
 while (pos < sentence.size()) {
   pos = sentence.find(" ", old_pos);
   words[i++].assign(sentence, old_pos, pos - old_pos);
   cout << words[i - 1] << endl; //print words
   old_pos = pos + 1;
 }
 nwords = i;
 sentence = "C++ programmers ";
 for (i = 1; i < nwords -1; ++i)
   sentence += words[i] + " ";
 sentence += "windows";
 cout << sentence << endl;

}</source>