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In function apri_file() when you pass "out" variable (which is a pointer) it is passed by copy. You assigned to this copy a value (by "f" variable), but it will not affect "out" variable. You should pass back "f" as function return, or get it by reference or pointer (to FILE pointer). For example:
void apri_file(FILE** f, const char* path, const char* mode)
*f = fopen(path, mode);
// rest of function
// and calling by
apri_file(&out, "elenco.txt", "w");
but the output is not the same that records I write in elenco.txt file.
An output example output of my program is
Inserisci il cognome: McPippo
Inserisci il nome: Pippo
Inserisci il numero di telefono: 080513245
Vuoi continuare, se si inserisci 1, altrimenti 0: 0
What's the problem?
Why I insert McPippo, Pippo and 080513245 in elenco.txt and when I read by file the output is McPippo, Pippo and 0805132455080513245?