Computer Science Illuminated
7th Edition
ISBN: 9781284155617
Author: Nell Dale, John Lewis
Publisher: Jones & Bartlett Learning
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Chapter 6, Problem 46E
Explanation of Solution
Assembly-language
The assembly-language program to read the three input variables “number1”, “number2”, and “number3” and to perform arithmetic operations on those numbers is as follows:
| Symbol | Mnemonics | Operand | Comment |
| BR | Main | ; Branch to the location Main | |
| number1: | .BLOCK | 2 | ; Set up a two byte block for number1 |
| number2: | .BLOCK | 2 | ; Set up a two byte block for number2 |
| number3: | .BLOCK | 2 | ; Set up a two byte block for number3 |
| result: | .BLOCK | 2 | ; Set up a two byte block for result |
| Main: | DECI | number1,d | ; Read and store number1 |
| DECI | number2,d | ; Read and store number2 | |
| DECI | number3,d | ; Read and store number3 | |
| LDA | number1,d | ; Load number1 value into the accumulator | |
| ADDA | number3,d | ; Add number3 to accumulator and store output into the accumulator | |
| SUBA | number2,d | ; Subtract number2 from the accumulator and store output into the accumulator | |
| STA | result,d | ; Store accumulator value into result | |
| DECO | result,d | ; Write result value on the screen | |
| STOP | ; Stop the processing | ||
| .END | ; End of the program |
Explanation:
In the above given program,
- Initially, it sets up the size for the variables “number1”, “number2”, “number3” and result as 2 bytes long.
- Read the value for the variable “number1” from the user.
- Read the value for the variable “number2” from the user...
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Chapter 6 Solutions
Computer Science Illuminated
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