Mathematica Referring to elements of a table in Mathematica

[MostlyHarmless]

See title.

I have a table that I've named B. And I want to create table that is essentially the change in values of B. If I was writing this on paper I would say: Let $b_i \in B$, for $0\leq i\leq100$. Then let $c_i \in C$ such that $c_i= b_{i+1}-b_{i}$. I don't know how to say that in Mathematica's language though.

Another option I guess would be to find a way to assign an indexed variable to each value of the table. With the indexing variable being the same.

 

[mfb]

The help page suggests something along the line of C=B[[2;;100]]-B[[1;;99]], but I cannot test it here.
Something that certainly works is a loop.