std::cout not giving out vector contents...

[donvigor]

Write your question here.
ok so this is just a part of the whole code... after running
i don't get to see content of the vector on terminal...
but the size comes out as 24...
????

 std::cout<<std::endl;
std::cout<<"size of last vector is "<<sizeof(values_to_play)<<std::endl;

std::cout<<"this are values to play:"<<std::endl;
for(auto ptr = values_to_play.begin(); ptr != values_to_play.end(); ptr++)
{
 std::cout<<values_to_play[*ptr]<<", ";

}

std::cout<<std::endl;

std::cout<<"values to play size is  "<<sizeof(values_to_play);

this is what appears on terminal? Isn't it strange ?

size of last vector is 24
this are values to play:

values to play now 24
row - minus is 300


THIS IS NO. OF ROWS 300
Process returned 0 (0x0)   execution time : 0.029 s
Press ENTER to continue.

[firedraco]

There are several errors in that code you have posted.

1) sizeof does not get the length of the vector, it gets the size of vector object. Use .length instead: values_to_play.length()
2) When using iterators, all you need to do is dereference the iterator: std::cout<<*ptr<<", ";

[JLBorges]

#include <iostream>
#include <vector>
#include <iterator>
#include <algorithm>

int main()
{
    std::vector<int> values_to_play { 0, 1, 2, 3, 4, 5 };

    // option one: range based for
    std::cout << "size: " << values_to_play.size() << "    values: [ " ;
    for( int v : values_to_play ) std::cout << v << ' ' ;
    std::cout << "]\n" ;

    // option two: iterate using positions
    std::cout << "size: " << values_to_play.size() << "    values: [ " ;
    for( std::size_t i = 0 ; i < values_to_play.size() ; ++i ) std::cout << values_to_play[i] << ' ' ;
    std::cout << "]\n" ;

    // option three: iterator
    std::cout << "size: " << values_to_play.size() << "    values: [ " ;
    for( auto iter = values_to_play.begin() ; iter != values_to_play.end() ; ++iter ) std::cout << *iter << ' ' ;
    std::cout << "]\n" ;

    // option four: std::for_each with a callable object
    std::cout << "size: " << values_to_play.size() << "    values: [ " ;
    std::for_each( values_to_play.begin(), values_to_play.end(), []( int v ) { std::cout << v << ' ' ; } ) ;
    std::cout << "]\n" ;

    // option five: std::copy with an output stream iterator
    std::cout << "size: " << values_to_play.size() << "    values: [ " ;
    std::copy( values_to_play.begin(), values_to_play.end(), std::ostream_iterator<int>( std::cout, " " ) ) ;
    std::cout << "]\n" ;
}

http://coliru.stacked-crooked.com/a/71e3ab3995efe202