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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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Please help provide answers for the following questions 2-26. The following bytes (shown in hex) represent a person’s name as it would be stored in a computer’s memory. Each byte is a padded ASCII code. Determine the name of each person. (a) 42 45 4E 20 53 4D 49 54 48 (b) Write the Phrase in ascii : I will score an A grade 2-30. Perform each of the following conversions. For some of them, you may want to try several methods to see which one works best for you. For example, a binary-to-decimal conversion may be done directly, or it may be done as a binary-to-hex conversion followed by a hex-to decimal conversion.= _2: binary _10: decimal _16: hexadecimal (a) 517_10 = _____ _2 (b) 255_10 = _____ _2 (c) 101010001_2 = _____ _10 (d) 1010101000100111_2 = _____ _10 (e) 2547_10 = _____ _16 (f) 567_10 = _____ (BCD) (g) 275_16 = _____ _10 (h) 53_10= _____ _16 (i) A79_16 = _____ _10 (j) 3ED5_16 = _____ _10 (k) 1760_10 = _____ _16 (l) 38,218_10 = ______ _16 (m) 873_10 = _____ (BCD) (n) 100101000111 (BCD) = _____ _10 (o) 4617_16 = _____ _2 (p) B034_16 = _____ _2 (q) 0110100 (BCD) = ______ _2 (r) 11010_2 =_____ (BCD) 2-33. Write the binary number that results when each of the following numbers is incremented by one. a) 0111 (b) 010011 (c) 1011 2-34. Decrement each binary number. 1110 (b) 101000 (c) 11010 2-35. Write the number that results when each of the following hex numbers is incremented. (a) 7749 (b) 996 (c) OFFF (d) 2000 (e) 9FF (f) 10A 2-36. Repeat Problem 2-35 for the decrement operation. Optional: 2-37. In a microcomputer, the addresses of memory locations are binary numbers that identify each memory circuit where a byte is stored. The number of bits that make up an address depends on how many memory locations there are. Since the number of bits can be very large, the addresses are often specified in hex instead of binary. (a) If a microcomputer uses a 32-bit address, how many different memory locations are there? (b) How many hex digits are needed to represent the address of a memory location? (c) What is the hex address of the 512th memory location? (Note: The first address is always 0.) 2-38. In an audio CD, the audio voltage signal is typically sampled about 44,100 times per second, and the value of each sample is recorded on the CD surface as a binary number. In other words, each recorded binary number represents a single voltage point on the audio signal waveform. (a) If the binary numbers are six bits in length, how many different possible voltage values can be represented by a single binary number (six bits)? Repeat for eight bits and ten bits. (b) If ten-bit numbers are used, how many bits will be recorded on the CD in 1 second? (c) If a CD can typically store 24 billion bits, how many seconds of audio can be recorded when ten-bit numbers are used? 2-40. A 3-Mega-pixel digital camera stores an eight-bit number for the brightness of each of the primary colors (red, green, blue) found in each picture element (pixel). If every bit is stored (no data compression), how many pictures can be stored on a 128-Megabyte memory card? (Note: In digital systems, Mega means 2^20.)

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