C: incompatible types in assignment

Question

I\'m writing a program to check to see if a port is open in C. One line in particular copies one of the arguments to a char array. However, when I try to compile, it says:

Answer 1

an alternative is to use a char * instead:

char *addr;

addr = strdup(argv[2]);

strdup is basically a shortcut that does a malloc and a strcpy, and you don't have to worry about the size of addr upfront. Don't forget to free addr once you're done.
Note that if argv[2] is NULL you will get a segfault.