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Task/Mandelbrot-set/ERRE/mandelbrot-set.erre

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+PROGRAM MANDELBROT
+
+!$KEY
+!$INCLUDE="PC.LIB"
+
+BEGIN
+
+SCREEN(7)
+GR_WINDOW(-2,1.5,2,-1.5)
+FOR X0=-2 TO 2 STEP 0.01 DO
+    FOR Y0=-1.5 TO 1.5 STEP 0.01 DO
+        X=0
+        Y=0
+
+        ITERATION=0
+        MAX_ITERATION=223
+
+        WHILE (X*X+Y*Y<=(2*2) AND ITERATION<MAX_ITERATION) DO
+            X_TEMP=X*X-Y*Y+X0
+            Y=2*X*Y+Y0
+
+            X=X_TEMP
+
+            ITERATION=ITERATION+1
+        END WHILE
+
+        IF ITERATION<>MAX_ITERATION THEN
+            C=ITERATION
+          ELSE
+            C=0
+        END IF
+
+        PSET(X0,Y0,C)
+    END FOR
+END FOR
+END PROGRAM