C++/String/string at

Accessing Character Elements of an STL String

<source lang="cpp">

1. include <string>
2. include <iostream>

int main(){

  using namespace std;
  string str ("Hello String");
  for(size_t i = 0; i < str.length(); ++ i){
      cout << "Character [" << i << "] is: ";
      cout << str [i] << endl;
  }
  cout << endl;
  return 0;

}

 </source>

Demonstrating member function at

<source lang="cpp">

1. include <iostream>

using std::cout; using std::endl;

1. include <string>

using std::string; int main() {

  string string1( "cat" );
  string string2;
  string string3;
  string2 = string1;
  string3.assign( string1 );
  
  cout << "string1: " << string1 << "\nstring2: " << string2
     << "\nstring3: " << string3 << "\n\n";
  // demonstrating member function at
  for ( int i = 0; i < string3.length(); i++ ) 
     cout << string3.at( i );
  return 0;

} /* string1: cat string2: cat string3: cat cat"

*/        
   
 </source>

Display the characters in a string one at a time by using the indexing operator

<source lang="cpp">

1. include <iostream>
2. 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";
 for(unsigned i = 0; i < str1.size(); ++i)
   cout << "str1[i]: " << str1[i] << endl;
 cout << endl;
 return 0;

}

 </source>

Get a C-Style String from a C++ String

<source lang="cpp">

1. include <cstdio>
2. include <string>

using namespace std; int main( ) {

  string boss( "B" );
  printf( "%s is an important man.\n\n", boss.c_str() ); 
  char man[50];
  strcpy( man, boss.c_str() );
  strupr( man );
  printf( "this is a test: %s\n", man );

}

 </source>