`bc` doesn't do floating point but it does do fixed precision decimal numbers:
it doesn't round.
precision of fractional numbers is given by `scale`, defaults to 0:

    1/2
    0
    scale=2
    1/2
    .50

with `-l` a math library will be loaded (providing sine, cosine and some more)
and scale will be set to 20.

c-like programmming language, supports loops, functions and stuff:

    scale=1
    for (m=70; m<=100; m++) m/(1.85^2)


control output w/ `print`:

    print var1, " ", var2