Compilare: user.cpp: In function ‘void dif()’: user.cpp:9: warning: left-hand operand of comma has no effect user.cpp: In function ‘void print()’: user.cpp:74: warning: statement has no effect user.cpp: In function ‘int main()’: user.cpp:124: warning: unused variable ‘n’ user.cpp:121: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:122: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:127: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:128: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:135: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result