| 摘要 |
PURPOSE:To prevent such errors as the decision omission or the duplication of the logical attribute of the exclusive output by deciding the logical attribute of the exclusive output of a symbol having the logical attribute in its output. CONSTITUTION:A pin attribute buffer 1-4b holds temporarily the pin attribute of a symbol having the logical attribute in its output at input of this symbol. Then the buffer 1-4b inputs the symbol while checking its contents. In other words, the logical attribute of one of both outputs is decided and therefore the logical attribute of the other output is allocated. Thus the logical attribute of one of both outputs of an 'IF' symbol of a flow chart is inputted to a mouse 1-2, a keyboard chart 1-1, etc., from an input device in the form 'YES'. Thus the logical attribute of the other output is decided as 'NO' and a graphic editing device is not required to perform the input of 'NO'.
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