# strings can be converted using [float](http://julia.readthedocs.org/en/latest/stdlib/base/#Base.float) and [int](http://julia.readthedocs.org/en/latest/stdlib/base/#Base.int): e_str1 = "2.718" e = float(e_str1) println(5e) #> 13.5914 num_15 = parse(Int, "15") println(3num_15) #> 45 # numbers can be converted to strings and formatted using [printf](http://julia.readthedocs.org/en/latest/stdlib/base/#Base.@printf) @printf "e = %0.2f\n" e #> 2.718 # or to create another string [sprintf](http://julia.readthedocs.org/en/latest/stdlib/base/#Base.@sprintf) e_str2 = @sprintf("%0.3f", e) # to show that the 2 strings are the same println("e_str1 == e_str2: $(e_str1 == e_str2)") #> e_str1 == e_str2: true # available number format characters are [f, e, g, c, s, p, d](https://github.com/JuliaLang/julia/blob/master/base/printf.jl#L15): # (pi is a predefined constant; however, since its type is # "MathConst" it has to be converted to a float to be formatted) @printf "fix trailing precision: %0.3f\n" float(pi) #> fix trailing precision: 3.142 @printf "scientific form: %0.6e\n" 1000pi #> scientific form: 3.141593e+03 # g is not implemented yet @printf "a character: %c\n" 'α' #> a character: α @printf "a string: %s\n" "look I'm a string!" #> a string: look I'm a string! @printf "right justify a string: %50s\n" "width 50, text right justified!" #> right justify a string: width 50, text right justified! @printf "a pointer: %p\n" 100000000 #> a pointer: 0x0000000005f5e100 @printf "print a integer: %d\n" 1e10 #> print an integer: 10000000000