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Task/Arithmetic-Complex/Smart-BASIC/arithmetic-complex.basic

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+' complex numbers are native for "smart BASIC"
+A=1+2i
+B=3-5i
+
+' all math operations and functions work with complex numbers
+C=A*B
+PRINT SQR(-4)
+
+' example of solving quadratic equation with complex roots
+' x^2+2x+5=0
+a=1 ! b=2 ! c=5
+x1=(-b+sqr(b^2-4*a*c))/(2*a)
+x2=(-b-sqr(b^2-4*a*c))/(2*a)
+print x1,x2
+
+' gives output
+-1+2i    -1-2i