Rounding Techniques
Following are routines for rounding to the setting of the Decimal Wheel in addition, subtraction
and multiplication. Assume one value is stored in the B register and the second value in the e
register:
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ADDITION SUBTRACTION MULTIPLICATION ___________________________
B
B
B
Transfer first value to A register.
C + C - C x Perform operation.
R - R - R - Subtract complete result from trun cated result.
Transfer complete result to A register.
R - R - R - Subtract negative remainder from complete result.
A
A
A
Print rourded result.
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Following are techniques for rounding the Quotient in a division problem to the setting of the
Decimal Wheel:
METHOD 1:
Assume the divisor is in register B and the dividend is in register C.
C
Transfer dividend to A register.
B
÷
Divide dividend by divisor.
R
Transfer iemainder to A register.
C + Add dividend to remainder.
R
Transfer decimally correct dividend + remainder to A register.
B
÷
Divide dividend + remainder by divisor.
A
Print rounded Quotient.
This routine requires 7 instructions.
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