A function is not deigned in to another function. It is because that would lead to dependency injection.
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No the two work together REALLY
Absolutely. Indeed, any function (user-defined or built-in) that does not return a value is not really a function, it is simply a procedure.
Default functions are pre defined functions.Eg. printf();scanf();getch();clrscr();etc..Actually, no-one uses the term 'default function'. (Let alone 'defult function'.)Another answer: Perhaps it is 'main' what you meant.
Not possible.
If the function has been declared and defined, then the only remaining issue is scope, i.e. visibility.