Compilare: user.cpp: In function ‘void read()’: user.cpp:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void pre_df(int)’: user.cpp:47: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void elimina(int)’: user.cpp:69: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void descompun(int, int, int)’: user.cpp:97: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:178: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void elimina(int)’: user.cpp:58: warning: ‘mxi’ may be used uninitialized in this function