Electronic calculating machine with facilities of announcing data introduced

An electronic cash register comprising:

• input means for entering product code information related to a product to be sold, said input means including a bar code reader for reading bar code information in connection with the specific article, a plurality of input keys for entering a specific price of the article, and function key for entering the type of article involved in a transaction;
• price determination means responsive to said input means for determining the price of said product from its related produce code information;
• classification means responsive to said price determination means for generating a price range signal representative of one of a plurality of price ranges, said price range signal generated being representative of a code which in simplified manner represents the price range in which the price of said product is included;
• audible frequency generator means for producing an audio frequency signal from said price range signal, said audio frequency signal being representative of the price range in which the price of said product is included;
• sound generator means responsive to said audible frequency generator means for generating an audible indication of the price range in which the price of said product is included, an operator thereby determining if a price determined by said price determination means is erroneous in magnitude;
• and
• operator actuatable means operatively connected to said price determination means for correcting said determined price when said price range is determined by the operator to be erroneous from said audible indication.