Compilare: user.cpp: In function ‘void read()’: user.cpp:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void afis(int)’: user.cpp:151: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘nod’ user.cpp: In function ‘int main()’: user.cpp:158: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:159: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result