vectors

study vectors

.push_back() - adds a single element to the end of a vector.

void push_back( const TYPE& val )
  
This code appends the element val to the end of the vector
                                                          vectors5.cc

.pop_back() - remove a single element from the end of a vector.

void pop_back();
                                                          vectors5.cc

.size() - returns the number of elements in the vector.

std::vector<int> vectorOne(10,5);
for (long index=0; index<(long)vectorOne.size(); ++index)

//size determines index boundary = 10)
                                                          
std::vector<int> vectorOne(10,5);

std::cout << "Size of vector is " << vectorOne.size() << " elements." << std::endl;

for (long index=0; index<(long)vectorOne.size(); ++index) {
  std::cout << "Element " << index << ": " << vectorOne.at(index) << std::endl;
}
/* OutPut:
    Size of vector is 10 elements.
    Element 0: 5
    Element 1: 5
    Element 2: 5
    Element 3: 5
    Element 4: 5
    Element 5: 5
    Element 6: 5
    Element 7: 5
    Element 8: 5
    Element 9: 5
  */
                                                       vectors2.cc