printf("What's your name?:\t");
printf("Well, then hello, world from %s", Name);
scanf("%[^\n]", &Name);has two errors:
&Nameis not a pointer to char, it is a pointer to an array of 21 char. The correct syntax is
%20[^\n]in this case (20 letters and 1 null terminator), instead of the unlimited
%[^\n]. Otherwise someone could type more than 20 characters and cause buffer overrun, which leads to anywhere from crashing to having all your passwords stolen.