| 摘要 |
A keyboard input language is employed that enables the operator to combine numerical factors into algebraic terms in which multiply and divide operators appear in their normal algebraic context and to form algebraic sums of these terms by postfixing add and subtract operators. The algebraic sum of an algebraic number (representing an algebraic term) contained in a first register and of another algebraic number (representing another algebraic term) contained in a second register is formed by employing an adder for adding the number portions of the algebraic numbers contained in the first and second registers when the sign portions of these algebraic numbers are alike and by employing a circuit for complementing the sign and number portions of the algebraic number contained in the first register when the sign portions of the algebraic numbers contained in the first and second registers are different, employing an adder for thereafter adding the number portions of the algebraic numbers contained in the first and second registers, and employing a circuit for treating the sign and the sum of the number portions of these algebraic numbers without the most significant digit of the sum as the algebraic sum when the algebraic number contained in the first register has been complemented and the most significant digit of the sum is an overflow and for complementing the sign and the sum of the number portions of these algebraic numbers to get the algebraic sum when the algebraic number contained in the first register has been complemented and the most significant digit of the sum is not an overflow.
|
