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:133: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/cc8ILfL3.o: In function `main': user.cpp:(.text+0x33e): warning: the `gets' function is dangerous and should not be used.