Assume proper includes have been executed, but not using directive or declaration. Write a definition of an iterator for a vector named vec of int values. Write a for loop that will display the contents vec on the screen, separated by spaces starting at the last element in the vector and proceeding to the first. Use iterators for the loop control.

Question

What will be an ideal response?

Answer 1

#include
#include
using std::vector;
using std::cout;
using std::endl;

int main()
{
std::vector::reverse_iterator itr;
std::vector vec;

for(int i=0; i<10; i++)
vec.push_back(i);

for (itr = vec.rbegin(); itr != vec.rend(); itr++)
cout << *itr << " ";
cout << endl;
return 0;
}
Explanation: The parts that are requested in the problem are in bold face. The std:: on vector is necessary to make this code work with VC++6.0 prior to patch level 5. This hack does not affect the program under Borland command line compiler 5.5.