How do command line tools change their output after outputting it?

Question

I\'ve noticed that a lot of command line tools, wget for example, will show progress as a number or progress bar that advances as a process is completed. While the question isn\

Answer 1

They probably use the fancy ncurses library but on my Linux for my personal command-line tools I simply send '\r' to move the cursor back to the start of the line to overwrite it with new progress information.

#include 
#include 
#include 

int main()
{
    for(auto i = 0; i < 100; ++i)
    {
        std::cout << "\rprogress: " << i << "%        " << std::flush;
        std::this_thread::sleep_for(std::chrono::milliseconds(100));
    }

    std::cout << "\rprogress: DONE             " << std::flush;
}