Merge pull request #66 from tsingbx/complex

add doc for complex

109-Complex-Numbers/complex-1.gop

@@ -0,0 +1,7 @@
+# Initializing Complex Numbers
+// There are two complex types in Go+. The complex64 and the complex128.
+// Initializing complex numbers is really easy. You can use the constructor or the initialization syntax as well.
+
+c1 := complex(10, 11) // constructor init
+c2 := 10 + 11i        // complex number init syntax
+println c1, c2

109-Complex-Numbers/complex-2.gop

@@ -0,0 +1,7 @@
+# Parts of a Complex Number
+// There are two parts of a complex number. The real and imaginary part. We use functions to get those.
+
+cc := complex(23, 31)
+realPart := real(cc) // gets real part
+imagPart := imag(cc) // gets imaginary part
+println realPart, imagPart

109-Complex-Numbers/complex-3.gop

@@ -0,0 +1,15 @@
+# Operations on a Complex Number
+// A complex variable can do any operation like addition, subtraction, multiplication, and division.
+//
+// Let’s see an example to perform mathematical operations on the complex numbers.
+
+c11 := complex(10, 11) // constructor init
+c22 := 10 + 11i        // complex number init syntax
+
+ccc := complex(2, 3)
+cc2 := 4 + 5i            // complex initializer syntax a + ib
+cc3 := c11 + c22         // addition just like other variables
+println "Add: ", cc3     // prints "Add: (6+8i)"
+re := real(cc3)          // get real part
+im := imag(cc3)          // get imaginary part
+println ccc, cc2, re, im // prints 6 8