这个错误不知道是怎么回事？
error: unresolved symbols remain
error: errors encountered during linking; "./Debug/scilianxi.out" not built

这几个警告也是不知道问题在哪里？看到很多解决方法都不对啊
"sci.c", line 26: warning: function declared implicitly
"sci.c", line 27: warning: function declared implicitly
"sci.c", line 29: warning: function declared implicitly
"sci.c", line 39: warning: function declared implicitly
"sci.c", line 50: warning: function declared implicitly