Variables and Types in Objective-C and C Programming
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The document discusses fundamental programming concepts such as variables and data types, including examples of how to declare and use them in code. It covers different types such as integers, floats, characters, and structures, illustrating how they can be assigned and manipulated. Additionally, it highlights the use of pointers to reference memory addresses and access variables directly.
Variables and Types in Objective-C and C Programming
- 1. Paul Solt iPhoneDev.tv Variables andTypes The buildings blocks of apps
- 3. Paul Solt iPhoneDev.tv Coffee •17 ml water : 1 g coffee •950 ml water / 17 ml/g = ? •55.8 g coffee
- 4. Paul Solt iPhoneDev.tv Variables Give the CPU something to remember
- 5. Paul Solt iPhoneDev.tv // Declare a variable to store water float water; // Store the amount of water to use water = 950; // milliliters // Display message printf("Brew %f milliliters of coffee", water);
- 6. Paul Solt iPhoneDev.tv int age = 26;
- 7. Paul Solt iPhoneDev.tv int age = 26; type
- 8. Paul Solt iPhoneDev.tv int age = 26; type name
- 9. Paul Solt iPhoneDev.tv int age = 26; type name expression
- 10. Paul Solt iPhoneDev.tv int age = 26; type name expression assignment operator
- 11. Paul Solt iPhoneDev.tv int age = 26;
- 12. Paul Solt iPhoneDev.tv int age = 26; 26age
- 13. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b;
- 14. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b; a
- 15. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b; a b
- 16. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b; b 5a
- 17. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b; 5a 20b
- 18. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b; 5a 20 5+b b
- 19. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b; 5a 20 5+20 b
- 20. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b; 5a 25 5+20 b
- 21. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b; 5a 25b
- 22. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b; 5 a-b a 25b
- 23. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b; 5 5-25 a 25b
- 24. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b; -20 5-25 a 25b
- 25. Paul Solt iPhoneDev.tv int a; int b; a = 5; b = 20; b = 5 + b; a = a - b; -20a 25b
- 26. Paul Solt iPhoneDev.tv Types What kind of information are we storing?
- 27. Paul Solt iPhoneDev.tv •short/int/long: -1,0,1 •float/double: 3.14 •char: ‘a’, ‘b’, ‘c’ •pointers: int * (memory address) •struct: composition (x, y)
- 28. Paul Solt iPhoneDev.tv short small = 12; int medium = 2000000; long large = 90133726844735000;
- 29. Paul Solt iPhoneDev.tv float smaller = 3.14; double larger = 3.14159265359;
- 30. Paul Solt iPhoneDev.tv char firstLetter = 'a'; char percent = '%';
- 31. Paul Solt iPhoneDev.tv int *address = 0; int x = 18; address = &x; *address = 27; address x 0x1234 0x5544
- 32. Paul Solt iPhoneDev.tv int *address = 0; int x = 18; address = &x; *address = 27; address x 0x1234 0x5544 0
- 33. Paul Solt iPhoneDev.tv int *address = 0; int x = 18; address = &x; *address = 27; address x 0x1234 0x5544 0 18
- 34. Paul Solt iPhoneDev.tv int *address = 0; int x = 18; address = &x; *address = 27; address x 0x1234 0x5544 0 18
- 35. Paul Solt iPhoneDev.tv int *address = 0; int x = 18; address = &x; *address = 27; address x 0x1234 0x5544 &x 0 18
- 36. Paul Solt iPhoneDev.tv int *address = 0; int x = 18; address = &x; *address = 27; address x 0x1234 0x5544 0x5544 &x 18
- 37. Paul Solt iPhoneDev.tv int *address = 0; int x = 18; address = &x; *address = 27; address x 0x1234 0x5544 0x5544 &x 18
- 38. Paul Solt iPhoneDev.tv int *address = 0; int x = 18; address = &x; *address = 27; address x 0x1234 0x5544 0x5544 18 *address
- 39. Paul Solt iPhoneDev.tv int *address = 0; int x = 18; address = &x; *address = 27; address x 0x1234 0x5544 0x5544 27 *address
- 40. Paul Solt iPhoneDev.tv int *address = 0; int x = 18; address = &x; *address = 27; address x 0x1234 0x5544 0x5544 27
- 41. Paul Solt iPhoneDev.tv struct Point { int x; int y; }; ... struct Point a; a.x = 25; a.y = 100;
- 42. Paul Solt iPhoneDev.tv struct Point { int x; int y; }; ... struct Point a; a.x = 25; a.y = 100; (25, 100) y x
- 43. Paul Solt iPhoneDev.tv •short/int/long: -1,0,1 •float/double: 3.14 •char: ‘a’, ‘b’, ‘c’ •pointers: int * (memory address) •struct: composition (x, y)