/in/database.c: In function 'main':
/in/database.c:31:11: warning: implicit declaration of function 'gets'; did you mean 'fgets'? [-Wimplicit-function-declaration]
     while(gets(com)!=NULL)
           ^~~~
           fgets
/in/database.c:31:20: warning: comparison between pointer and integer
     while(gets(com)!=NULL)
                    ^~
/tmp/cc23gUQ4.o: In function `main':
database.c:(.text.startup+0x176): warning: the `gets' function is dangerous and should not be used.