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Introduction to Programming

Introduction to Programming. CGS 3460, Lecture 2 Jan 11, 2006 Hen-I Yang. Previously…. Temporary Course Web Site: http://www.cise.ufl.edu/class/cgs3460sp06/ Syllabus 6 Assignments + Quiz sets, the lowest grade is dropped Optional Comprehensive Exam Academic Dishonesty Policy

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Introduction to Programming

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  1. Introduction to Programming CGS 3460, Lecture 2 Jan 11, 2006 Hen-I Yang

  2. Previously… • Temporary Course Web Site:http://www.cise.ufl.edu/class/cgs3460sp06/ • Syllabus • 6 Assignments + Quiz sets, the lowest grade is dropped • Optional Comprehensive Exam • Academic Dishonesty Policy • Practice Make Perfect • Questionnaire Due Today (1/11)

  3. Cold Pizza • You have to take the associated quiz if you want a particular assignment counted toward your final grade • It is your right to ask any questions that may help you learn. Your instructor and TAs have the responsibility to make sure you understand, both inside and outside of the classroom. Ask questions as soon as you get any, don’t put off.

  4. Today’s Special • What is a computer? • A Tour Behind the Scene. • What is a program? • Why do we bother to write programs? • How do programs work?

  5. 1889 Hollerith Tabulator http://www.cs.umass.edu/~weems/CmpSci535/Discussion2.html, http://www.digibarn.com/history/first-chm-visit/page_02.htm

  6. Lee De Forest invents the vacuum tube which is used as an early form of • computer memory holding the values of zero and one by being on or off • http://mason.gmu.edu/~montecin/vacuum_tube.html

  7. 1939 Dr. John V. Atanasoff and his graduate assistant Clifford Berry build the first electronic digital computer http://www.cedmagic.com/history/atanasoff-berry-computer.html

  8. 1947 The giant ENIAC (Electrical Numerical Integrator and Calculator). machine was developed by John W. Mauchly and J. Presper Eckert, Jr. at the University of Pennsylvania. It was only programmable by changing the wiring, not through software changes, but was productive from 1946 to 1955 and was used to compute artillery firing tables. http://www.geocities.com/itpic45/

  9. 1001 1101 1110 0011 106fc: 9d e3 bf 88 save %sp, -120, %sp 10700: 90 10 20 19 mov 0x19, %o0 10704: 40 00 40 71 call 208c8 <_PROCEDURE_LINKAGE_TABLE_+0x78> 10708: 01 00 00 00 nop 1070c: 82 10 00 08 mov %o0, %g1 10710: c2 27 bf ec st %g1, [ %fp + -20 ] 10714: 03 00 00 41 sethi %hi(0x10400), %g1 10718: 90 10 63 f8 or %g1, 0x3f8, %o0 ! 107f8 <_lib_version+0x8> 1071c: 40 00 40 6e call 208d4 <_PROCEDURE_LINKAGE_TABLE_+0x84> 10720: 01 00 00 00 nop 10724: 03 00 00 42 sethi %hi(0x10800), %g1 10728: 90 10 60 10 or %g1, 0x10, %o0 ! 10810 <_lib_version+0x20> 1072c: d2 07 bf ec ld [ %fp + -20 ], %o1 10730: 40 00 40 6c call 208e0 <_PROCEDURE_LINKAGE_TABLE_+0x90> 10734: 01 00 00 00 nop 10738: 03 00 00 42 sethi %hi(0x10800), %g1 1073c: 90 10 60 18 or %g1, 0x18, %o0 ! 10818 <_lib_version+0x28> 10740: d2 07 bf ec ld [ %fp + -20 ], %o1 10744: 40 00 40 6a call 208ec <_PROCEDURE_LINKAGE_TABLE_+0x9c> 10748: 01 00 00 00 nop 1074c: 82 10 20 00 clr %g1 ! 0 <_START_-0x10000> 10750: b0 10 00 01 mov %g1, %i0 10754: 81 c7 e0 08 ret 10758: 81 e8 00 00 restore 1075c: 81 c3 e0 08 retl 10760: ae 03 c0 17 add %o7, %l7, %l7

  10. Summary • Program/Software allows us to instruct computers how to perform various tasks. • Programs are written in a language with a specific set of grammars and interpretations that computers could understand. • Why do we want to implement programs?

  11. Reference • History of Computers http://www.ceap.wcu.edu/Houghton/EDELCompEduc/Ch1/historykeylist.html

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