6.40.txt

a)
int ff(int a, int b = 0, int c = 0);

b)
char *init(int ht = 24, int wd, char bckgrnd);

// error: after providing a default value for an element, the rightmost elements from the default argumented parameter need to be default argumented too
fix:

char *init(int wd, char bckgrnd, int ht = 24);