You input arguments into your program using argc and argv. argc is number of arguments and argv is the list of arguments.

There is no string in c so you use char pointers instead. But in previous code he used char, which is usually defines a single string, but main actually inputs an array of string so it should have been char* (pointer to pointer of char, or pointer to 'string')

Basically he did something like this in Java

public static void main(String args)

instead of

public static void main(String args[])