printf giving me incorrect output in C

Question

This is probably a very elementary problem, but I cannot find the answer anywhere, and this is the first time I\'ve had the problem after several weeks of programming in C. In e

Answer 1

The calling conventions are different in printf, and scanf.

Printf's arguments are typically by value (no &), but scanf has to have pointers. (&)
(You can't put a new value to e.g. 1.0, but you can print it...)