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Task/Prime-decomposition/ERRE/prime-decomposition.erre

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+PROGRAM DECOMPOSE
+
+
+!
+! for rosettacode.org
+!
+
+!VAR NUM,J
+
+DIM PF[100]
+
+PROCEDURE STORE_FACTOR
+   PF[0]=PF[0]+1
+   PF[PF[0]]=CA
+   I=I/CA
+END PROCEDURE
+
+PROCEDURE DECOMP(I)
+  PF[0]=0  CA=2 ! special case
+  LOOP
+     IF I=1 THEN EXIT PROCEDURE END IF
+     EXIT IF INT(I/CA)*CA<>I
+     STORE_FACTOR
+  END LOOP
+  FOR CA=3 TO INT(SQR(I)) STEP 2 DO
+     LOOP
+        IF I=1 THEN EXIT PROCEDURE END IF
+        EXIT IF INT(I/CA)*CA<>I
+        STORE_FACTOR
+     END LOOP
+  END FOR
+  IF I>1 THEN CA=I STORE_FACTOR END IF
+END PROCEDURE
+
+BEGIN
+ ! ----- function generate
+ ! in ...  I     ... number
+ ! out ... PF[]  ... factors
+ !         PF[0] ... # of factors
+ ! mod ... CA    ... pr.fact. candidate
+ PRINT(CHR$(12);) !CLS
+ INPUT("Numero ",NUM)
+ DECOMP(NUM)
+ PRINT(NUM;"=";)
+ FOR J=1 TO PF[0] DO
+    PRINT(PF[J];)
+ END FOR
+ PRINT
+END PROGRAM