Wrong data type accept in sqlite while creating table

I have planed to create a editor for sqlite, I have created many part successfully but when I enter the create statement it is created successfully, but when I created with wrong data type it is also created successfully.
1) How is it possible?
2) If it is created, is it will affect in feature.
3) How can I control this.

I told about the below statement

CREATE TABLE tb_merbinee(name TEXeT,AGE INTEGER,Mark INTEGER);