C++ Tutorial/string/string insert

changing parts of string objects

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

 #include <string>  
 using namespace std;  
   
 int main(){  
    string s1("this is a test");  
    string s2("is");  
    string s3("test");  
   
    s1.erase(0, 7);               
    s1.replace(9, 5, s2);         
    s1.replace(0, 1, "s");        
    s1.insert(0, s3);             
    s1.erase(s1.size()-1, 1);     
    s1.append(3, "!");            
   
    int x = s1.find(" ");         
    while( x < s1.size() ){  
       s1.replace(x, 1, "/");
       x = s1.find(" ");     
    }  
    cout << "s1: " << s1 << endl;  
    return 0;  
 }</source>

Insert one string at location 10 of another string

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

1. include <string>

using std::string; int main() {

  string string1( "AAAAAAA end" );
  string string2( "CCCCCCC " );
  string string3( "12345678" );
  string string4( "xx" );
  cout << "Initial strings:\nstring1: " << string1
     << "\nstring2: " << string2 << "\nstring3: " << string3
     << "\nstring4: " << string4 << "\n\n";
  // insert string2 at location 10 in string1
  string1.insert( 10, string2 );
  cout << "Strings after insert:\nstring1: " << string1
     << "\nstring2: " << string2 << "\nstring3: " << string3
     << "\nstring4: " << string4 << endl;
  return 0;

}</source>

Initial strings:
string1: AAAAAAA end
string2: CCCCCCC
string3: 12345678
string4: xx
Strings after insert:
string1: AAAAAAA enCCCCCCC d
string2: CCCCCCC
string3: 12345678
string4: xx

string.insert()

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

1. include <string>

using namespace std; int main() {

 string str1("String handling C++ style.");
 string str2("STL Power");
 cout << "Initial strings:\n";
 cout << "str1: " << str1 << endl;
 cout << "str2: " << str2 << "\n\n";
 // demonstrate insert()
 cout << "Insert str2 into str1:\n";
 str1.insert(6, str2);
 cout << str1 << "\n\n";
 return 0;

}</source>

Initial strings:
str1: String handling C++ style.
str2: STL Power
Insert str2 into str1:
StringSTL Power handling C++ style.

string.insert( 3, string4, 0, string::npos )

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

1. include <string>

using std::string; int main() {

  string string1( "beginning end" );
  string string2( "middle " );
  string string3( "12345678" );
  string string4( "xx" );
  cout << "Initial strings:\nstring1: " << string1
     << "\nstring2: " << string2 << "\nstring3: " << string3
     << "\nstring4: " << string4 << "\n\n";
  // insert string4 at location 3 in string3
  string3.insert( 3, string4, 0, string::npos );
  cout << "Strings after insert:\nstring1: " << string1
     << "\nstring2: " << string2 << "\nstring3: " << string3
     << "\nstring4: " << string4 << endl;
  return 0;

}</source>

Initial strings:
string1: beginning end
string2: middle
string3: 12345678
string4: xx
Strings after insert:
string1: beginning end
string2: middle
string3: 123xx45678
string4: xx