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The algorithm of Figure 10.5 always produces a string of four characters independent of the sign and magnitude of the integer being converted. Devise an algorithm that eliminates unnecessary characters in common representations, that is, an algorithm that does not store leading 0s nor a leading + sign.

The algorithm of Figure 10.5 always produces a string of four characters independent of the sign and magnitude of the integer being converted. Devise an algorithm that eliminates unnecessary characters in common representations, that is, an algorithm that does not store leading 0s nor a leading + sign.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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The algorithm of Figure 10.5 always produces a string of four characters independent of the sign and magnitude of the integer being converted. Devise an algorithm that eliminates unnecessary characters in common representations, that is, an algorithm that does not store leading 0s nor a leading + sign.

 

I have attached figure 10.5, can you please give me direction on how to solve this problem? Thank you! 

386 TETONNEAEG 01 02 03 04 05 06 07 08 09 ОВ OC OD ОЕ OF 10 11 12 13 14 15 16 89ABCDEF 1D 1E 1F 20 21 22 LNMHEENOGABLOONMASON 2008 chapter 10 A Calculator : This subroutine converts a 2's complement integer within the range : -999 to +999 (located in RO) into an ASCII character string consisting of a sign digit, followed by three decimal digits, and stores the : character string into the four memory locations starting at ASCIIBUFF (see Figure 10.4). ; BinarytOASCII ST ST ST 17 : 18 19 1A 1B 1C 2D 2E 2F 30 31 NegSign ; Begin100 Loop100 ; End100 ; 23 24 Loop10 25 26 27 28 29 2A 2B Beginl End10 2C 32 33 34 ASCIIplus 35 ASCIIminus 36 ASCIIoffset 37 Neg100 38 Pos100 ST LD ADD 39 BtoA_Save0 3A BtoA_Savel 3B BtoA_Save2 BtoA_Save3 LD STR NOT ADD LD LD ADD BRn ADD BRn LD STR BRnzp Begin100 STR LD ADD LD ADD BRn ADD BRnzp End100 R2, R2, #1 BRnzp Loop100 STR ADD RO, BtoA_Save0 R1, BtoA_Savel R2, BtoA_Save2 R3, BtoA_Save3 LD ADD STR LD R1,BtoA ASCIIBUFF : R1 keeps track of output string. RO, RO,#0 : RO contains the binary value. ; NegSign R2,ASCIIplus : First store the ASCII plus sign. R2, R1,#0 LD LD LD RET R2, ASCIIminus R2, R1,#0 RO, RO RO, RO, #1 R2, ASCII offset R3, Neg100 RO, RO, R3 R2, R1, #1 R3, Pos100 RO, RO, R3 RO.RO.#-10 End10 R2, R2, #1 Loop10 : First store ASCII minus sign. : Convert the number to absolute value; it is easier to work with. Prepare for "hundreds" digit. : Determine the hundreds digit. : Store ASCII code for hundreds digit. : Correct RO for one-too-many subtracts. R2, ASCIIoffset: Prepare for "tens" digit. : Determine the tens digit. .FILL X002B .FILL X002D .FILL x0030 .FILL #-100 .FILL #100 .BLKW #1 .BLKW #1 .BLKW #1 .BLKW #1 30 3D BtoA_ASCIIBUFF .FILL ASCIIBUFF Figure 10.5 Binary-to-ASCII conversion subroutine. R2, R1. #2 Store ASCII code for tens digit. RO, RO . #10: Correct RO for one-too-many subtracts. R2, ASCIIoffset: Prepare for "ones" digit. R2, R2, RO R2, R1, #3 RO, BtoA_Save0 R1,BtoA_Savel R2, BtoA_Save2 R3, BtoA_Save3
Transcribed Image Text:386 TETONNEAEG 01 02 03 04 05 06 07 08 09 ОВ OC OD ОЕ OF 10 11 12 13 14 15 16 89ABCDEF 1D 1E 1F 20 21 22 LNMHEENOGABLOONMASON 2008 chapter 10 A Calculator : This subroutine converts a 2's complement integer within the range : -999 to +999 (located in RO) into an ASCII character string consisting of a sign digit, followed by three decimal digits, and stores the : character string into the four memory locations starting at ASCIIBUFF (see Figure 10.4). ; BinarytOASCII ST ST ST 17 : 18 19 1A 1B 1C 2D 2E 2F 30 31 NegSign ; Begin100 Loop100 ; End100 ; 23 24 Loop10 25 26 27 28 29 2A 2B Beginl End10 2C 32 33 34 ASCIIplus 35 ASCIIminus 36 ASCIIoffset 37 Neg100 38 Pos100 ST LD ADD 39 BtoA_Save0 3A BtoA_Savel 3B BtoA_Save2 BtoA_Save3 LD STR NOT ADD LD LD ADD BRn ADD BRn LD STR BRnzp Begin100 STR LD ADD LD ADD BRn ADD BRnzp End100 R2, R2, #1 BRnzp Loop100 STR ADD RO, BtoA_Save0 R1, BtoA_Savel R2, BtoA_Save2 R3, BtoA_Save3 LD ADD STR LD R1,BtoA ASCIIBUFF : R1 keeps track of output string. RO, RO,#0 : RO contains the binary value. ; NegSign R2,ASCIIplus : First store the ASCII plus sign. R2, R1,#0 LD LD LD RET R2, ASCIIminus R2, R1,#0 RO, RO RO, RO, #1 R2, ASCII offset R3, Neg100 RO, RO, R3 R2, R1, #1 R3, Pos100 RO, RO, R3 RO.RO.#-10 End10 R2, R2, #1 Loop10 : First store ASCII minus sign. : Convert the number to absolute value; it is easier to work with. Prepare for "hundreds" digit. : Determine the hundreds digit. : Store ASCII code for hundreds digit. : Correct RO for one-too-many subtracts. R2, ASCIIoffset: Prepare for "tens" digit. : Determine the tens digit. .FILL X002B .FILL X002D .FILL x0030 .FILL #-100 .FILL #100 .BLKW #1 .BLKW #1 .BLKW #1 .BLKW #1 30 3D BtoA_ASCIIBUFF .FILL ASCIIBUFF Figure 10.5 Binary-to-ASCII conversion subroutine. R2, R1. #2 Store ASCII code for tens digit. RO, RO . #10: Correct RO for one-too-many subtracts. R2, ASCIIoffset: Prepare for "ones" digit. R2, R2, RO R2, R1, #3 RO, BtoA_Save0 R1,BtoA_Savel R2, BtoA_Save2 R3, BtoA_Save3
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