Assignment # 1 1. Convert 82ADh to decimal. 2. Convert 11101b to decimal. 3. Convert 2BD4h to decimal. 4. Convert 95 to binary. 5. Convert 2B3Ch to binary. 6. Convert 1110101010b to hex. 7. Add 3546d and 1872d. 8. Add 5B39h and 7AF4h. 9. Add 100101111b and 110110. 10. Subtract 7283d from 9145d. 11. Subtract BA94h from D26Fh. 12. Subtract 0111b from 1001. 13. Find one’s compliment of 5. 14. Find two’s compliment of 5. 15. Find two’s compliment of the two’s compliment of 5. 16. In many applications, it saves time to memorize the conversions among small binary, decimal, and hex numbers. Fill in the blanks in the following table: Binary Decimal Hex _____ 9 _____ 1010 _____ _____ _____ _____ D _____ 12 _____ 1110 _____ _____ _____ _____ B 17. Convert the following binary and hex numbers to decimal: a. 1110 b. 100101011101 c. 46Ah d. FAE2Ch 18. Convert the following numbers: a. 1001011 to hex b. 1001010110101110 to hex c. A2Ch to binary d. B34Dh to binary 19. Perform the following additions: a. 100101b + 10111b b. 100111101b + 1001111001b c. B23CDh + 17912h d. FEFFFh + FBCADh 20. Perform the following subtractions: a. 11011b – 10110b b. 10000101b – 111011b c. 5FC12h – 3ABD1h d. F001Eh – 1FF3Fh

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Data Dictionary

A database management system has an entity-relationship diagram, data dictionary, and data model as some of its key components, which are tools for the users who are managing the database. One of them is the data dictionary. The data dictionary can also be called metadata. By definition, metadata is a generic concept in the world of information and technology. An example of metadata could be meta-information about a media file or an image file, like author, location, last updated, size, etc. The contents of a data dictionary are names, attributes, and properties of main data elements which are captured during an experiment or stored in an information system, for example, databases. We can also call it a central repository of information about the main data.