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Task/Ackermann-function/ERRE/ackermann-function.erre

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+PROGRAM ACKERMAN
+
+!
+! computes Ackermann function
+! (second version for rosettacode.org)
+!
+
+!$INTEGER
+
+DIM STACK[10000]
+
+!$INCLUDE="PC.LIB"
+
+PROCEDURE ACK(M,N->N)
+  LOOP
+    CURSOR_SAVE(->CURX%,CURY%)
+    LOCATE(8,1)
+    PRINT("Livello Stack:";S;"  ")
+    LOCATE(CURY%,CURX%)
+    IF M<>0 THEN
+       IF N<>0 THEN
+           STACK[S]=M
+           S+=1
+           N-=1
+        ELSE
+           M-=1
+           N+=1
+        END IF
+        CONTINUE LOOP
+     ELSE
+        N+=1
+        S-=1
+    END IF
+    IF S<>0 THEN
+        M=STACK[S]
+        M-=1
+        CONTINUE LOOP
+      ELSE
+        EXIT PROCEDURE
+    END IF
+  END LOOP
+END PROCEDURE
+
+BEGIN
+   PRINT(CHR$(12);)
+   FOR X=0 TO 3 DO
+     FOR Y=0 TO 9 DO
+        S=1
+        ACK(X,Y->ANS)
+        PRINT(ANS;)
+     END FOR
+     PRINT
+   END FOR
+END PROGRAM