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Functions in Objective-C and C Programming

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Course Link: http://skl.sh/11kA0im …

Course Link: http://skl.sh/11kA0im
Website: http://iPhoneDev.tv

Learn about functions which allow you to organize your code into chunks. Functions allow you to delegate work between different blocks of code.


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  • 1. Paul SoltiPhoneDev.tvFunctionsInstruction manuals for computers
  • 2. Paul SoltiPhoneDev.tvOutline•Functions•Stack Frame•Recursion•Debugging•GlobalVariables
  • 3. Paul SoltiPhoneDev.tv
  • 4. Paul SoltiPhoneDev.tvDesk1. Build small drawer2. Build large drawer3. Build desk frame4. Insert small drawer5. Insert large drawer
  • 5. Paul SoltiPhoneDev.tvArea = A x BAreaAB
  • 6. Paul SoltiPhoneDev.tvint area(int sideA, int sideB)
  • 7. Paul SoltiPhoneDev.tvint area(int sideA, int sideB)return type
  • 8. Paul SoltiPhoneDev.tvint area(int sideA, int sideB)namereturn type
  • 9. Paul SoltiPhoneDev.tvint area(int sideA, int sideB)name parameterreturn typeparameter
  • 10. Paul SoltiPhoneDev.tvint area(int sideA, int sideB)
  • 11. Paul SoltiPhoneDev.tvint area(int sideA, int sideB){int result = sideA * sideB;return result;}
  • 12. Paul SoltiPhoneDev.tvint total = area(4, 2);
  • 13. Paul SoltiPhoneDev.tvint total = area(4, 2);arguments
  • 14. Paul SoltiPhoneDev.tvint total = area(4, 2);8arguments
  • 15. Paul SoltiPhoneDev.tvint total = area(4, 2);
  • 16. Paul SoltiPhoneDev.tvStack Frame•“Sandbox”•LocalVariables
  • 17. Paul SoltiPhoneDev.tvStack Frame•“Sandbox”•LocalVariablesmain()total = area(4,2);
  • 18. Paul SoltiPhoneDev.tvStack Frame•“Sandbox”•LocalVariablesmain()total = area(4,2);area(4,2)sideA = 4sideB = 2result = 8
  • 19. Paul SoltiPhoneDev.tvStack Frame•“Sandbox”•LocalVariablesmain()total = area(4,2);
  • 20. Paul SoltiPhoneDev.tvStack Frame•“Sandbox”•LocalVariablesmain()total = 8;
  • 21. Paul SoltiPhoneDev.tvStack Frame•“Sandbox”•LocalVariables
  • 22. Paul SoltiPhoneDev.tvArea
  • 23. Paul SoltiPhoneDev.tvRecursionSpace Shuttle: CountdownTimer1. Display number2. Subtract one3. Repeat steps 1 and 2 (until 0) STS-110, NASA
  • 24. Paul SoltiPhoneDev.tvRecursion
  • 25. Paul SoltiPhoneDev.tvRecursionvoid countDown(int number) {if(number == 0) {printf("Take off!n");} else {printf("T-minus %d secondsn", number);int nextNumber = number - 1;countDown(nextNumber);}}
  • 26. Paul SoltiPhoneDev.tvRecursionvoid countDown(int number) {if(number == 0) {printf("Take off!n");} else {printf("T-minus %d secondsn", number);int nextNumber = number - 1;countDown(nextNumber);}}
  • 27. Paul SoltiPhoneDev.tvRecursionvoid countDown(int number) {if(number == 0) {printf("Take off!n");} else {printf("T-minus %d secondsn", number);int nextNumber = number - 1;countDown(nextNumber);}}
  • 28. Paul SoltiPhoneDev.tvStack Frame
  • 29. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)
  • 30. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)countDown(5)nextNumber = 4countDown(4)
  • 31. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)countDown(5)nextNumber = 4countDown(4)countDown(4)nextNumber = 3countDown(3)
  • 32. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)countDown(5)nextNumber = 4countDown(4)countDown(4)nextNumber = 3countDown(3)countDown(3)nextNumber = 2countDown(2)
  • 33. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)countDown(5)nextNumber = 4countDown(4)countDown(4)nextNumber = 3countDown(3)countDown(3)nextNumber = 2countDown(2)countDown(2)nextNumber = 1countDown(1)
  • 34. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)countDown(5)nextNumber = 4countDown(4)countDown(4)nextNumber = 3countDown(3)countDown(3)nextNumber = 2countDown(2)countDown(2)nextNumber = 1countDown(1)countDown(1)nextNumber = 0countDown(0)
  • 35. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)countDown(5)nextNumber = 4countDown(4)countDown(4)nextNumber = 3countDown(3)countDown(3)nextNumber = 2countDown(2)countDown(2)nextNumber = 1countDown(1)countDown(1)nextNumber = 0countDown(0)countDown(0)take off!
  • 36. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)countDown(5)nextNumber = 4countDown(4)countDown(4)nextNumber = 3countDown(3)countDown(3)nextNumber = 2countDown(2)countDown(2)nextNumber = 1countDown(1)countDown(1)nextNumber = 0countDown(0)
  • 37. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)countDown(5)nextNumber = 4countDown(4)countDown(4)nextNumber = 3countDown(3)countDown(3)nextNumber = 2countDown(2)countDown(2)nextNumber = 1countDown(1)
  • 38. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)countDown(5)nextNumber = 4countDown(4)countDown(4)nextNumber = 3countDown(3)countDown(3)nextNumber = 2countDown(2)
  • 39. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)countDown(5)nextNumber = 4countDown(4)countDown(4)nextNumber = 3countDown(3)
  • 40. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)countDown(5)nextNumber = 4countDown(4)
  • 41. Paul SoltiPhoneDev.tvStack Framemain()startNumber = 5countDown(5)
  • 42. Paul SoltiPhoneDev.tvStack Frame
  • 43. Paul SoltiPhoneDev.tvCountDown!
  • 44. Paul SoltiPhoneDev.tvGlobalVariablesint total = 10resetTotal()total = 0;updateTotal()total = total + 1;
  • 45. Paul SoltiPhoneDev.tvGlobalVariables
  • 46. Paul SoltiPhoneDev.tvReview•Functions•Stack Frame•Recursion•Debugging•GlobalVariables
  • 47. Paul SoltiPhoneDev.tv

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