Compilare: user.cpp: In function ‘int main()’: user.cpp:95: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:96: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:97: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp: In function ‘str val(int, int)’: user.cpp:25: warning: ‘i’ may be used uninitialized in this function /tmp/ccad7yGK.o: In function `main': user.cpp:(.text+0x2c6): warning: the `gets' function is dangerous and should not be used.