Insert element at the start of vector - C++ STL

C++ examples for STL:vector

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Description

Insert element at the start of vector

Demo Code

#include <iostream>
#include <vector>
using namespace std;
void show(const char *msg, vector<char> vect);
int main() {//w  ww. j  av  a  2  s .c  om
   // Declare an empty vector that can hold char objects.
   vector<char> v;
   // Declare an iterator to a vector<char>.
   vector<char>::iterator itr;
   // Obtain an iterator to the start of v.
   itr = v.begin();
   // Declare a reverse iterator.
   vector<char>::reverse_iterator ritr;
   // Create another vector that is the same as the first.
   vector<char> v2(v);
   show("The contents of v2: ",v2);
   cout << "\n";
   // Now, insert Z at the start of v.
   cout << "Insert Z at the start of v.\n";
   v.insert(v.begin(), 'Z');
   show("The contents of v: ", v);
   cout << "\n";
   return 0;
}
// Display the contents of a vector<char> by using an iterator.
void show(const char *msg, vector<char> vect) {
   vector<char>::iterator itr;
   cout << msg;
   for(itr=vect.begin(); itr != vect.end(); ++itr)
      cout << *itr << " ";
   cout << "\n";
}

Result


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