Question

I have some problem with program maybe some one can help me . So:

int main() {
    std::string col = "maly tekst"
    for_each(/* FILL IN #2*/ f());
    copy(/*FILL IN #3*/);
    std::cout << col; }

Output should be : TSKET YLAM
I know that i need to use Functor so i made something like this :

#include <iostream>
#include <string>
#include <algorithm>
class f{
public:
void operator() (char &k)const
{
   k = toupper(k);
}
};
int main(){
std::string col = "maly tekst";
for_each(col.begin(),col.end(),f());
copy(col.rbegin(),col.rend(),back_inserter(col));
std::cout << col << std::endl;
}

But now when i run it it returns :

MALY TEKSTTSKET YLAM

Can some one point me on right way , or help me with this example program ?

Thanks

E: Forgot to add that I can only use this functions in main , I cant add anything new

Answer 1

You can’t use std::copy to replace original container if you can’t use std::reverse. To print col with reverse order, another work around is to copy col to stream iterator directly.

for_each(col.begin(),col.end(),f());
std::copy(col.rbegin(), col.rend(), std::ostream_iterator<char>(std::cout, ""));