Compilare: user.cpp: In function ‘int main()’: user.cpp:15:12: warning: unused variable ‘nr’ [-Wunused-variable] int n, nr, p, prim, ultim; ^ user.cpp:17:10: warning: unused variable ‘x’ [-Wunused-variable] char x; ^ user.cpp:18:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d\n", &n); ^ user.cpp:24:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(ch, NMAX, fin); ^ user.cpp:50:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "\n"); ^