十七世纪讣算技术 1671, Gottfried Leibniz A Calculator that could perform multiplication and division as well as addition and subtraction Started with pascal calculator Added two additional sets of wheels that could perform multiplications and division by repetitive addition or subtraction Used Chains and pulleys 北京大学计算机科学技术系 计算机系统结构教研室GÜWÑÇj
°_+ ÑÇj+´‰DÔ H *RWWIULHG /HLEQL] $&DOFXODWRUWKDWFRXOGSHUIRUPPXOWLSOLFDWLRQDQG GLYLVLRQDVZHOODVDGGLWLRQDQGVXEWUDFWLRQ 6WDUWHGZLWK3DVFDO&DOFXODWRU $GGHGWZRDGGLWLRQDOVHWVRIZKHHOVWKDWFRXOG SHUIRUPPXOWLSOLFDWLRQVDQGGLYLVLRQE\UHSHWLWLYH DGGLWLRQRUVXEWUDFWLRQ 8VHG&KDLQVDQG3XOOH\V q3FÚÑÇ°_