/in/database.c: In function 'main':
/in/database.c:32:9: warning: implicit declaration of function 'gets'; did you mean 'fgets'? [-Wimplicit-function-declaration]
         gets(cmd);
         ^~~~
         fgets
/in/database.c:30:13: warning: unused variable 'i' [-Wunused-variable]
     int ret,i=0;
             ^
/in/database.c: In function 'delete2':
/in/database.c:107:17: warning: unused variable 'assignment_tmp' [-Wunused-variable]
     Assignment *assignment_tmp;
                 ^~~~~~~~~~~~~~
/in/database.c: In function 'logic':
/in/database.c:199:30: warning: unused variable '_h' [-Wunused-variable]
     int _a,_b,_c,_d,_e,_f,_g,_h;
                              ^~
/in/database.c:199:27: warning: unused variable '_g' [-Wunused-variable]
     int _a,_b,_c,_d,_e,_f,_g,_h;
                           ^~
/in/database.c:199:24: warning: unused variable '_f' [-Wunused-variable]
     int _a,_b,_c,_d,_e,_f,_g,_h;
                        ^~
/in/database.c:199:21: warning: unused variable '_e' [-Wunused-variable]
     int _a,_b,_c,_d,_e,_f,_g,_h;
                     ^~
/in/database.c:199:18: warning: unused variable '_d' [-Wunused-variable]
     int _a,_b,_c,_d,_e,_f,_g,_h;
                  ^~
/in/database.c:199:15: warning: unused variable '_c' [-Wunused-variable]
     int _a,_b,_c,_d,_e,_f,_g,_h;
               ^~
/in/database.c:199:12: warning: unused variable '_b' [-Wunused-variable]
     int _a,_b,_c,_d,_e,_f,_g,_h;
            ^~
/in/database.c:199:9: warning: unused variable '_a' [-Wunused-variable]
     int _a,_b,_c,_d,_e,_f,_g,_h;
         ^~
/tmp/ccqwTWUk.o: In function `main':
database.c:(.text.startup+0x76): warning: the `gets' function is dangerous and should not be used.