But that would suck if you want to blink a different pin. You have to change pin number in multiple lines and pray not to make a mistake. But this will work much better.
why not simply define a variable int led=13...? memory usage?
A char is a variable that can hold one character. A char * is a pointer to a memory location that can hold one or more chars. It must be made to actually point to some memory before it can be used.
could you please make an example in using char*...?