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OUT = IN1 + IN2 – IN3

OUT = IN1 + IN2 – IN3

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 following Little Man program is supposed to add two input numbers, subtract a third input number from the sum, and output the result, i.e., OUT = IN1 + IN2 – IN3

**Program Analysis: Debugging Exercise** This table represents a simple program using mnemonic codes and their corresponding numeric codes. Each instruction is stored in a "mailbox" or memory location. | Mailbox | Mnemonic Code | Numeric Code | |---------|---------------|--------------| | 00 | IN | 901 | | 01 | STO 99 | 399 | | 02 | IN | 901 | | 03 | ADD 99 | 199 | | 04 | STO 99 | 399 | | 05 | IN | 901 | | 06 | SUB 99 | 299 | | 07 | OUT | 902 | | 08 | COB | 000 | ### Task: Analyze the program and identify the error. Modify the program to produce the correct result. ### Problem: The program is intended to: 1. Read a number from the input (Mailbox 00). 2. Store it temporarily (Mailbox 01). 3. Read another number (Mailbox 02). 4. Add the stored number (Mailbox 03). 5. Store this sum (Mailbox 04). 6. Read a third number (Mailbox 05). 7. Subtract the previously stored sum (Mailbox 06). 8. Output the resultant value (Mailbox 07). 9. Finish execution (Mailbox 08). ### Solution: Upon reviewing, the sequence may be incorrect or inefficient given the intended use. Consider rearranging or adjusting the storage and retrieval to ensure the correct calculation process. 1. Ensure values are correctly stored and retrieved as necessary. 2. Check each arithmetic operation correctly uses intended values. 3. Test the output to verify the accuracy of results.
Transcribed Image Text:**Program Analysis: Debugging Exercise** This table represents a simple program using mnemonic codes and their corresponding numeric codes. Each instruction is stored in a "mailbox" or memory location. | Mailbox | Mnemonic Code | Numeric Code | |---------|---------------|--------------| | 00 | IN | 901 | | 01 | STO 99 | 399 | | 02 | IN | 901 | | 03 | ADD 99 | 199 | | 04 | STO 99 | 399 | | 05 | IN | 901 | | 06 | SUB 99 | 299 | | 07 | OUT | 902 | | 08 | COB | 000 | ### Task: Analyze the program and identify the error. Modify the program to produce the correct result. ### Problem: The program is intended to: 1. Read a number from the input (Mailbox 00). 2. Store it temporarily (Mailbox 01). 3. Read another number (Mailbox 02). 4. Add the stored number (Mailbox 03). 5. Store this sum (Mailbox 04). 6. Read a third number (Mailbox 05). 7. Subtract the previously stored sum (Mailbox 06). 8. Output the resultant value (Mailbox 07). 9. Finish execution (Mailbox 08). ### Solution: Upon reviewing, the sequence may be incorrect or inefficient given the intended use. Consider rearranging or adjusting the storage and retrieval to ensure the correct calculation process. 1. Ensure values are correctly stored and retrieved as necessary. 2. Check each arithmetic operation correctly uses intended values. 3. Test the output to verify the accuracy of results.
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