Initial Commit

Code/3.arithmetic.jl

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+
+
+# 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()
+