samlerepo/2019/Julia/Code/3.arithmetic.jl

42 lines
1.1 KiB
Julia

# Also possible to enforce types on local variables
function main()
# Int is an alias for Int32 or Int64 depending on your installation
# 32 bit vs 64 bit
a::Int = 14
b::Int = 7
# Enforces the type of c for the rest of the scope
c::Int = a + b
@show typeof(c) c # The @show macro is basically a debug print
# Normal division of integers returns Float64
# Assignment to c tries to convert result to the
# type of c as the type is enforced.
# If unable to convert to Int it throws an appropriate exception
c = a / b
@show typeof(c) c
# // is rational division. This returns a rational number
c = a // b
@show typeof(c) c
# Integer division is done by div, fld or cld (floor divide/ceil divide)
# div rounds towards zero (1.5 -> 1, -2.7 -> -2)
# floor rounds downwards (1.5 -> 1, -2.7 -> -3)
# ceil rounds upwards (1.5 -> 2, -2.7 -> -2)
c = div(a, b)
c = fld(a, b)
c = cld(a, b)
# Exponentiation is done with the ^ symbol as in most calculator programs
c = a^b
@show c
end
main()