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Wentworth Institute of Technology Engineering & Technology WIT COMP1000 Introduction to Computing Wentworth Institute of Technology Engineering & Technology A Bit of History 2 WIT COMP1000 Do. Learn. Succeed. Wentworth Institute of

  1. Wentworth Institute of Technology Engineering & Technology WIT COMP1000 Introduction to Computing

  2. Wentworth Institute of Technology Engineering & Technology A Bit of History 2 WIT COMP1000 Do. Learn. Succeed.

  3. Wentworth Institute of Technology Engineering & Technology A Bit of History 3 WIT COMP1000 Do. Learn. Succeed.

  4. Wentworth Institute of Technology Engineering & Technology What Makes Up a Computer? § Hardware » Physical components » Wide variety of types and manufacturers » Abstracted to a simple set of ideas for Computer Science § Software » Programs (i.e., instructions) » Wide variety of purposes » The focus of this course 4 WIT COMP1000 Do. Learn. Succeed.

  5. Wentworth Institute of Technology Engineering & Technology High Level Hardware View Input Devices Processor (CPU) Output Devices Main Memory (RAM) Storage Devices … 5 WIT COMP1000 Do. Learn. Succeed.

  6. Wentworth Institute of Technology Engineering & Technology Main Memory (RAM) 01110011 byte 0 byte 1 01110100 4 bytes at 01100001 address 0 byte 2 01110010 byte 3 Addresses byte 4 01110111 2 bytes at address 4 01100001 byte 5 byte 6 01110010 2 bytes at address 6 byte 7 01110011 … 6 WIT COMP1000 Do. Learn. Succeed.

  7. Wentworth Institute of Technology Engineering & Technology Running a Program CPU doesn't understand Java directly Processor (CPU) Memory (RAM) Data/Input Output … Storage Device Program 7 WIT COMP1000 Do. Learn. Succeed.

  8. Wentworth Institute of Technology Engineering & Technology Compilers Byte Code Java Source Code 01111010000101010100 10001101000110100011 class HelloWorld { Java 11100101010100101001 public static void main(String[] args) { System.out.println("Hello World"); Compiler 10001010110001010000 } 01110101010111000110 } 01100100001001101010 10101001000011110001 11000000011110100010 1010101010010001110… 8 WIT COMP1000 Do. Learn. Succeed.

  9. Wentworth Institute of Technology Engineering & Technology Java Virtual Machine § Java byte code also can't be executed by a CPU directly § Instead, the Java Virtual Machine (JVM) is another program that interprets the byte code and translates it into the native CPU language » Allows a program to be compiled once and run on all types of computers (that have a JVM available and installed) § Other high level languages work differently 9 WIT COMP1000 Do. Learn. Succeed.

  10. Wentworth Institute of Technology Engineering & Technology Building a Java Program Processor (CPU) Memory (RAM) Java Source Java Byte Code Code … Storage Device Java Compiler 10 WIT COMP1000 Do. Learn. Succeed.

  11. Wentworth Institute of Technology Engineering & Technology Running a Java Program Processor (CPU) Memory (RAM) Program Java Byte Program Input Output Code … Storage Device JVM Libraries 11 WIT COMP1000 Do. Learn. Succeed.

  12. Wentworth Institute of Technology Engineering & Technology Take Home Points § Computers have 5 main components: Processor, Main Memory, Input Devices, Output Devices, Storage Devices § 1 byte = 8 bits (binary digits) § Main Memory is a sequence of bytes, each with a memory address § The Java compiler turns source code into byte code § The JVM uses that byte code along with additional libraries in order to execute your program 12 WIT COMP1000 Do. Learn. Succeed.

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