The basic operation of a vector: size, push_back,

#include <iostream>
#include <vector>
#include <cctype>
using namespace std;
int main()
{
  vector<char> vectorObject(10);         // create a vector of length 10
  unsigned int i;
                                                
  cout << "Size = " << vectorObject.size() << endl;

  for(i=0; i<10; i++) 
     vectorObject[i] = i + 'a';

  cout << "Current Contents:\n";

  for(i=0; i<vectorObject.size(); i++) 
     cout << vectorObject[i] << " ";
  cout << "\n\n";
  cout << "Expanding vector\n";

  for(i=0; i<10; i++) 
     vectorObject.push_back(i + 10 + 'a');

  cout << "Size now = " << vectorObject.size() << endl;

  cout << "Current contents:\n";

  for(i=0; i<vectorObject.size(); i++) 
     cout << vectorObject[i] << " ";

  cout << "\n\n";

  for(i=0; i<vectorObject.size(); i++) 
     vectorObject[i] = toupper(vectorObject[i]);

  cout << "Modified Contents:\n";

  for(i=0; i<vectorObject.size(); i++) 
    cout << vectorObject[i] << " ";

  cout << endl;
  return 0;
}

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The basic operation of a vector: size, push_back, : Vector « Data Structure « C++

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