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//#include <iostream>
//using namespace std;
 
 
#include <vector>
#include <string>
#include <iterator>
 
std::vector<char *> fabricate(std::vector<std::string> const & v)
{
    std::vector<char *> res(v.size() + 1, NULL);
    for (std::size_t i = 0; i != v.size(); ++i) { res[i] = v[i].c_str(); }
    return res;
}
 
std::vector<std::string> const args_vector((std::istream_iterator<std::string>(std::cin)), std::istream_iterator<std::string>());
 
std::vector<char *> argv_vector = fabricate(args_vector);
 
int main(int argc, char * argv[])
{
    argc = args_vector.size();
    argv = argv_vector.data();
 
    // ...
    printf("argc %d\n",argc);
    printf("argv %s", argv);
 
    return 0;
}

prog.cpp: In function ‘std::vector<char*, std::allocator<char*> > fabricate(const std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&)’:
prog.cpp:12: error: invalid conversion from ‘const char*’ to ‘char*’
prog.cpp: At global scope:
prog.cpp:16: error: ‘cin’ is not a member of ‘std’
prog.cpp: In function ‘int main(int, char**)’:
prog.cpp:27: warning: format ‘%s’ expects type ‘char*’, but argument 2 has type ‘char**’

Standard output is empty