Permalink
Switch branches/tags
Nothing to show
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
34 lines (28 sloc) 1.3 KB
# [function](http://docs.julialang.org:8000/en/latest/manual/functions/#functions) to calculate the volume of a sphere
function sphere_vol(r)
# julia allows [Unicode names](http://docs.julialang.org/en/latest/manual/unicode-input/) (in UTF-8 encoding)
# so either "pi" or the symbol π can be used
return 4/3*pi*r^3
end
# functions can also be defined more succinctly
quadratic(a, sqr_term, b) = (-b + sqr_term) / 2a
# calculates x for 0 = a*x^2+b*x+c, [arguments types](TODO: links) can be defined in function definitions
function quadratic2(a::Float64, b::Float64, c::Float64)
# unlike other languages 2a is equivalent to 2*a
# a^2 is used instead of a**2 or pow(a,2)
sqr_term = sqrt(b^2-4a*c)
r1 = quadratic(a, sqr_term, b)
r2 = quadratic(a, -sqr_term, b)
# multiple values can be returned from a function using tuples
# if the [return](http://docs.julialang.org:8000/en/latest/manual/functions/#the-return-keyword) keyword is omitted, the last term is returned
r1, r2
end
vol = sphere_vol(3)
# @printf allows number formatting but does not automatically append the \n to statements, see below
@printf "volume = %0.3f\n" vol
#> volume = 113.097
quad1, quad2 = quadratic2(2.0, -2.0, -12.0)
println("result 1: ", quad1)
#> result 1: 3.0
println("result 2: ", quad2)
#> result 2: -2.0