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Computer Science 101 Survey of Computer Science

Computer Science 101 Survey of Computer Science

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Computer Science 101 Survey of Computer Science

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  1. Computer Science 101Survey of Computer Science What is computer science?

  2. Course Goals • Provide broad view of the field of computer science for purposes of • general education. • further study of computer science.

  3. Computer Science - NOT JUST • The study of computers. • The study of computer programming. • The study of computer applications.

  4. Algorithm (informal) Algorithm: A step by step procedure for solving a general class of problems. Algorithm: What Bill Clinton plays on his saxophone.

  5. Programming VCR Step 1. If the clock and calendar are not correctly set, then go to page 9 of the owner's manual and follow instructions there. Step 2. Place a blank tape in the VCR tape slot. Step 3. Repeat steps 4-7 for each program, up to 10 times Step 4. Enter the channel number and press CHAN Step 5. Enter time to start and press TIME-START Step 6. Enter time to stop and press TIME-FINISH Step 7. If no more programs, press END-PROG Step 8. Press TIMER

  6. Algorithms on Youtube • Tying a Windsor Knot • Algorithm March with Prisoners • Sheldon’s Friendship Algorithm • Bubble Sort Algorithm • Quicksort Algorithm • Heap Sort Algorithm

  7. Sort Algorithm Demo • Use lab software for demo • Want to be president or work for Google?

  8. Adding m-digit numbers 478 a2 a1 a0 + 614 +b2 b1 b0 1092 c3 c2 c1 c0

  9. Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i < m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm c(m-1) … c0 Step 10. Stop

  10. a2 a1 a0 b2 b1 b0 carry 4 7 8 6 1 4 c3 c2 c1 c0 i m 3 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop

  11. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 c3 c2 c1 c0 i m 3 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop carry 0

  12. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 c3 c2 c1 c0 i m 3 0 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop carry 0

  13. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 c3 c2 c1 c0 i m 3 0 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop carry 0

  14. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 0 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 12 carry 0

  15. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 0 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 12 carry 0

  16. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 0 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 2 carry 0

  17. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 0 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 2 carry 1

  18. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 1 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 2 carry 1

  19. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 1 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 2 carry 1

  20. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 1 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 2 carry 1

  21. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 1 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 9 2 carry 1

  22. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 1 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 9 2 carry 1

  23. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 1 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 9 2 carry 1

  24. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 1 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 9 2 carry 0

  25. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 2 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 9 2 carry 0

  26. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 2 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 9 2 carry 0

  27. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 2 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 9 2 carry 0

  28. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 2 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 10 9 2 carry 0

  29. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 2 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 10 9 2 carry 0

  30. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 2 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 0 9 2 carry 0

  31. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 2 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 0 9 2 carry 1

  32. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 3 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 0 9 2 carry 1

  33. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 3 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 0 9 2 carry 1

  34. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 3 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 0 9 2 carry 1

  35. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 3 Output: Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 1 0 9 2 carry 1 1 0 9 2

  36. a2 a1 a0 b2 b1 b0 4 7 8 6 1 4 i m 3 3 Output: 1 0 9 2 Adding m-digit numbers Step 1. Set carry to 0 Step 2. Set i to 0 Step 3. While i<m do Step 4. Set ci to ai + bi + carry Step 5. If ci ≥ 10 then Set ci to ci - 10 Set carry to 1 else Set carry to 0 Step 6. Set i to i + 1 Step 7. End-of-loop Step 8. Set cm to carry Step 9. Print cm … c0 Step 10. Stop c3 c2 c1 c0 1 0 9 2 carry 1

  37. Three major control constructs of algorithms(Execution flow of instructions) • Sequential: Simply do steps one after the other in order they are listed. • Conditional: Decide which statement to do next based on some true/false test. • Iterative: A set of statements is repeated over and over until some condition is met.

  38. Algorithm (formal) A well-ordered collection of unambiguous and effectively computable operations that when executed produces a result and halts in a finite amount of time.

  39. Algorithm • Well-ordered: There is a clear order in which to do the operations. • Unambiguous: Each operation is clearly understood by all intended computing agents. • Effectively computable: The computing agent has ability to carry out each operation. • Finite time: Each operation takes finite time and there will be a finite number of steps.

  40. Computer Science

  41. Algorithms – Formal, mathematical properties • How will algorithm perform on big data sets? • Which algorithm is better for the task? • Is the algorithm correct? • Is there a feasible algorithm for the task? • Is it possible to have algorithm for the task? • Do we need an approximation algorithm?

  42. Hardware Realizations • How do we build machines that can execute algorithms? • How do we store the data in hardware? • How do we store the instructions in hardware? • Smaller and faster? • Networks, wireless, etc. • Robots?

  43. Linguistic realizations • Language that machine understands • Language that is understandable to humans • Translation from one to the other • Languages that are good for certain kinds of tasks – scientific computing, business computing, artificial intelligence, etc.

  44. Applications • Intelligent robots • Web applications, E-commerce • Medical imaging • Social networking

  45. That's not a rattler, what kinda snake is that?