C++/Vector/vector indexer

Fill in vector with array by using pointer and offset

<source lang="cpp">

1. include <algorithm>
2. include <iostream>
3. include <vector>

using namespace std; int main(int argc, char** argv) {

 int elems[] = {5, 6, 9, 8, 8, 3};
 vector<int> myVector(elems, elems + 6); 
 return (0);

}

 </source>

make the index of the maximum

<source lang="cpp">

1. include <algorithm>
2. include <iostream>
3. include <vector>

using namespace std; int main( ) {

  vector<int> v( 10, 66 );
  v[1] = 100;
  vector<int>::iterator before_itr = max_element( v.begin(), v.end() );
  cout << "The maximum before resizing is " << *before_itr;
  vector<int>::difference_type max_index = before_itr - v.begin();

}

 </source>

Use indexer to update element in the vector

<source lang="cpp">

1. include <iostream>

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

1. include <vector>
2. include <algorithm>
3. include <iterator>
4. include <stdexcept>

int main() {

  int array[ 6 ] = { 1, 2, 3, 4, 5, 6 };
  std::vector< int > integers( array, array + 6 );
  std::ostream_iterator< int > output( cout, " " );
  integers.push_back( 2 );
  integers.push_back( 3 );
  integers.push_back( 4 );
  cout << "Vector integers contains: ";
  std::copy( integers.begin(), integers.end(), output );
  integers[ 0 ] = 7; // set first element to 7
  cout << "\n\nVector integers contains: ";
  std::copy( integers.begin(), integers.end(), output );
  return 0;

} /* Vector integers contains: 1 2 3 4 5 6 2 3 4 Vector integers contains: 7 2 3 4 5 6 2 3 4

*/        
   
   
 </source>

Use toupper function to convert all elements in a char vector to upper case

<source lang="cpp">

1. include <iostream>
2. include <vector>
3. include <cctype>

using namespace std; int main() {

 vector<char> v(10); // create a vector of length 10
 cout << "Size = " << v.size() << endl;
 for(int i=0; i<10; i++) 
    v[i] = i + "a";
 cout << "Current Contents:\n";
 for(int i=0; i<v.size(); i++) cout << v[i] << " ";
 cout << "\n\n";
 
 for(int i=0; i<v.size(); i++) 
    v[i] = toupper(v[i]);
 cout << "Modified Contents:\n";
 for(int i=0; i<v.size(); i++) 
    cout << v[i] << " ";
 cout << endl;
 return 0;

} /* Size = 10 Current Contents: a b c d e f g h i j Modified Contents: A B C D E F G H I J

*/        
   
   
 </source>