I'm making my first "big project" in C and I'm currently working on the registration/login part. I would like to make the user insert an efficient password, asking him to insert characters and numbers (I'm not sure if i simply want to print a warning if the inserted password is unsafe or making the user repeat the inserting process but that's not important now). The password will be part of a struct called "user". So, in order to do this, how do i scan an input made of characters and numbers like "hfsk89skh3"??