Why is my function returning garbage when it should return a char?

Question

I\'m a newbie in C++ learning the language and playing around. I wrote a piece of code which behavior I don\'t understand. Could someone explain why the code below prints ou

Answer 1

If your aim is to pass the content of a std::string to a function modifying the content of a char*:

#include 
#include 

void f(char* s) {
    s[0] = 'H';
}

std::vector to_vector(const std::string& s) {
    return std::vector(s.c_str(), s.c_str() + s.size() + 1);
}

int main(void)
{
    std::string s = "_ello";
    std::vector t = to_vector(s);
    f(t.data());
    std::cout <<  t.data() << std::endl;
}