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*****　　ルート計算　　　　　    　　　　　   　     ***** 
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 A-ROOT-RTN.                                                
     DIVIDE  2  INTO  WK-INPUT  GIVING  WK-SYO         
                                REMAINDER  WK-AMARI.    
     MOVE  WK-SYO               TO  WK-ROOTCNT.           
     IF  WK-AMARI  NOT =  ZERO                           
         ADD  1                    TO  WK-ROOTCNT.       
     MOVE  WK-INPUT             TO  WK-Z  WK-Y.           
     PERFORM                                              
         VARYING  WK-TS4  FROM  1  BY  1                 
         UNTIL    WK-TS4  >  WK-ROOTCNT                  
             COMPUTE  WK-Z = (WK-Z + WK-Y / WK-Z) / 2    
     END-PERFORM.                                        
     MOVE  WK-Z                    TO  WK-OUTPUT.       
 A-ROOT-EXT.                                              
     EXIT.