Add all the A tasks

Task/Arithmetic-Complex/BASIC/arithmetic-complex.bas

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+TYPE complex
+        real AS DOUBLE
+        imag AS DOUBLE
+END TYPE
+DECLARE SUB add (a AS complex, b AS complex, c AS complex)
+DECLARE SUB mult (a AS complex, b AS complex, c AS complex)
+DECLARE SUB inv (a AS complex, b AS complex)
+DECLARE SUB neg (a AS complex, b AS complex)
+CLS
+DIM x AS complex
+DIM y AS complex
+DIM z AS complex
+x.real = 1
+x.imag = 1
+y.real = 2
+y.imag = 2
+CALL add(x, y, z)
+PRINT z.real; "+"; z.imag; "i"
+CALL mult(x, y, z)
+PRINT z.real; "+"; z.imag; "i"
+CALL inv(x, z)
+PRINT z.real; "+"; z.imag; "i"
+CALL neg(x, z)
+PRINT z.real; "+"; z.imag; "i"
+
+
+SUB add (a AS complex, b AS complex, c AS complex)
+        c.real = a.real + b.real
+        c.imag = a.imag + b.imag
+END SUB
+
+SUB inv (a AS complex, b AS complex)
+        denom = a.real ^ 2 + a.imag ^ 2
+        b.real = a.real / denom
+        b.imag = -a.imag / denom
+END SUB
+
+SUB mult (a AS complex, b AS complex, c AS complex)
+        c.real = a.real * b.real - a.imag * b.imag
+        c.imag = a.real * b.imag + a.imag * b.real
+END SUB
+
+SUB neg (a AS complex, b AS complex)
+        b.real = -a.real
+        b.imag = -a.imag
+END SUB