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You can only sign in with a UCR address Use the list to ask questions and interact with us and with other CS 12 students No postings containing codep6-+>3Today s TopicsStructured Programming Top-down approach Bottom-up approach Review of basic C++ Elementary data types Variables, operators Assignment op, automatic conversion Flow of control Functions main() Call by value Call by reference Overloading basicstZ%ZZiZ:Z%i:  K@Structured Programming(Split your problem into simpler parts then solve each part separately Recognize common parts and solve them only once Top-down approach Bottom-up approach Procedural programming Object-oriented programmingZvY9/Top-down approach(Break the problem down from the top into smaller and smaller parts More intuitive than bottom-up approach (more on this later) Functions are the natural tools to use (as opposed to objects)@ - Top-down approach(AExample: How to do well in CS 12 Must do well in the lecture part Must attend the lectures Must do the lecture readings ahead of time Must reserve some time to study Must do well in the lab part Must attend the labs Must do the lab readings ahead of time Must reserve some time to practice how to write and compile codel!!f}!!f}  A5 To_do_well_in(course) Must_do_well_in(lecture) Must_do_well_in(lab) Must_do_well_in(component) Must_attend(component) Must_do_readings_ahead_of_time() Must_reserve_time_to_study(component) Must_reserve_time_to_study(comp) If (comp is lecture) Reserve_time_to_study() Else // (comp is lab) Reserve_time_to_practice() Pseudo-code: code that is closer to a human language than to a programming language, but just as precise as a programming languageZ/ZZ_Z!ZZZZZZ/_!     wC7Bottom-up approach(JFigure out the smaller parts first, then put them together Less intuitive than top-down approach because it s not always easy to figure out what parts you need Objects are the natural tools to use (as opposed to functions) We ll get back to Bottom-up when we cover Object Oriented ProgrammingL&- HD8Bottom-up approach( Example: drawing program You ll probably need triangles, squares, circles, etc, even if you re not sure how they will all fit together in the end All of those things are shapes Every shape has a position and needs to be drawn Base class Shape x_pos, y_pos draw()E9Bottom-up approach(class Triangle is a Shape a, b, c // sides functions specific to a triangle class Square is a Shape len // length of side functions specific to a square class Circle is a Shape r // radius functions specific to a circleR36+#        euF:UML: Unified Modeling Language( H<Objects and Classes(Just as you can define an int variable int x, n, radius; You can also define a more complicated variable, an object of a given class: Triangle t = Triangle(3, 4, 5); Square sq = Square(10); Circle c = Circle(7); The cool thing is that because these objects are also Shape objects, they all know how to draw themselves b/c you defined a draw() function in the Shape class: t.draw(); // draws the triangle t sq.draw(); // draws the square sq c.draw(); // draws the circle c' nMU nl n 4 6X            ,I=Bottom-up approach(^Figure out the smaller parts (classes) first Then put them together have the objects created from those classes  interact with each other by calling each other s functions Bottom-up approach does not require OOP but OOP is the natural way to express Bottom-up ideas Much of CS 12 will be about OOPBFj uFjEMAReview of basic C++(Elementary data types Variables, operators Assignment op, automatic conversion Type casting Flow of control Functions main() Call by value Call by reference Overloading.vZ3Zv3OCElementary data types (All of the numerical types have an unsigned variant, as in unsigned int For details on the difference between signed and unsigned numbers, read handout 1XZ# I DRPD Variables (pAre  containers for values Must be declared before they can be used Are type-specific: an int variable is not the same as a float variable, for example Values are stored in memory cells, occupying a machine dependent amount of bytes. Eg: typically, an int takes 4 bytes Examples: int n = 3; float radius = 0.54;$  u[i P[QE Operators I (Let you manipulate your variables Arithmetic operators things like +, -, *, /, ++, -- Egs: (a + 3)*(b++) n++ use n, then increment n by 1 ++n increment n by 1, then use n Watch out for integer division ! 3 / 6 evaluates to ZERO 3.0 / 6.0 evaluates to 0.5 3 / 6.0 evaluates to 0.5 auto conversion 3.0 / 6 evaluates to 0.5 auto conversion7ZZZ7  #4,W?RF Operators II (Logical operators things like ==, !=, >, <, <=, >=, &&, || Evaluate to a bool (true or false) 3 > 5 evaluates to false 3 != 5 evaluates to true x == 5 result depends on the value of x && is the AND operator (3 > 5) && (3 != 5) results in false || is the OR operator (3 > 5) || (3 != 5) results in true Don t confuse == with = (assignment op)%$(       JSG Operators III(DAssignment operator int z = 5; declares z, sets its value to 5 and then returns that value Thus, for eg, (z = 7) == 2 returns false Don t confuse == with = if (z = 3) { /* do something */ } is valid (z = 3) returns 3 which is interpreted as true only 0 and 0.0 are interpreted as falseZZ/ZW Z  &                           >LByTHAutomatic conversion(If necessary, shorts are converted to ints, ints to longs, longs to floats, and floats to doubles Example: char c =  Z ; 3.6 * (c + 5); c is converted to an int, added to 5, the result is converted to a float and then multiplied by 3.6. The result is a float. This is an example of bad code, for at least two reasons. Can you guess them? Any non-zero numerical result appearing in a boolean expression is converted to true; 0 and 0.0 are converted to false 2kZZyZ     P&lCUIFlow of control(Things like if, while, do, for if (boolean expression) { /* do something */ } if (boolean expression) { /* do something */ } else { /* do something different */ } while (boolean expression) { /* do something */ }l8Z nZZA nZZ nZ >$)T$VJFlow of control(do { /* something */ } while (boolean expression) for (init; condition; modifier) { /* do something */ } for (int i = 0; i < MAX; i++) { cout << (2 * i) << endl; } Watch out for ; and , inside the ()"Z2 nZ Z nZZ nZ$Z . tK)WKL-values and R-values(>Suppose we have int x = 3; x == 5; // does this make sense ? P?Z $*XLL-values and R-values(WSuppose we have int x = 3; x == 5; // does this make sense ? Yes x = 5; // and this ? rXZ $CYML-values and R-values(wSuppose we have int x = 3; x == 5; // does this make sense ? Yes x = 5; // and this ? Yes 8 == x; // how about this ? xZ $cZNL-values and R-values(Suppose we have int x = 3; x == 5; // does this make sense ? Yes x = 5; // and this ? Yes 8 == x; // how about this ? Yes 8 = x; // and this ? Z $|[OL-values and R-values(Suppose we have int x = 3; x == 5; // does this make sense ? Yes x = 5; // and this ? Yes 8 == x; // how about this ? Yes 8 = x; // and this ? No ! Why not ? Because 8 is a literal valueZ \PL-values and R-values(8 = x; // illegal ! You can t assign values to a literal value Literal values are not L-values - you cannot have them on the left side of an assignment Values that can be on the left side are called L-values, those which can be on the right side are called R-values. The distinction is important when you consider functions and their return values.`Z ?# T^Q Functions I ( main() Every program must have one It s the entry point of execution of your program Must return an integer int main() Should return 0 if no problems are encountered Should return an error code if problems are encountered ZZ<X$ln_R Functions II (// function declarations void drawMonster(int monster_id, int x, int y) void moveMonster(int mnstr_id, float dx, float dy) // function definition int max(int a, int b) { if (a > b) return a; else return b; } // function call int z = max(r, s);Z nZ  uZ  Z uZ  Z nZ$Zc          @`S Functions III(Call by value The value of the argument is copied into a local variable inside the function void f(int x, float v) Call by reference The address in memory of the argument is passed to the function Lets you change the value of what s being passed to the function, from inside the function void f(int & x, float & v) & means  address of f+  ,c&aTCalls by value/reference(Important example: void swap(int x, int y) { int temp = x; x = y; y = temp; } Does not work! Inside the function body, x and y are local variables whose initial values are copies of the arguments.ZMZZwZL!$t  bUCalls by value/reference(Important example: void swap(int & x, int & y) { int temp = x; x = y; y = temp; } Now it does work! Inside the function body, x and y are not local variables; they represent the actual arguments When the function exits (returns), x and y have their values exchanged We ll see in detail how call by reference is accomplished when we study activation frames next week8ZQZZ8!Y5 > DcVFunction overloading(Signature of a function Name of the function Number of arguments Types of those arguments Order of those arguments The signature of a function includes neither the function s return type nor the names of the params It s ok to define many functions with the same name, as long as they have different signatures: Examples: void swap(int & x, int & y) void swap(char & x, char & y) void swap(float & x, float & y) void swap(double & x, double & y) This gets boring, is error-prone, and duplicates code& Is there a way to define a single swap function that applies to every type ? Yes ! That s done with Templates.nZ[ZZZZ   %T     x >uB6Reminder (If you have not read them yet, make sure to read handouts 1 & 2: intro_comp_org.pdf stack_frames.pdf For next lecture read sections 10.1, 10.2, and 10.3 of Savitch s book Have a great weekend !AZ' nZ^ZA +PA 6 /PsxHH@Rg(HH(dh   ` www3ff` 3fff` ___>?" dF@,?n<d@uA @ " d`  n?" dd@   @@``PR   @ ` `P0p>> - 2003 WL Truppel ZCS 12: Intro. Computer Science II " Lecture 2 X( = 2  N0?"! :    Ngֳgֳ ?"`0  T Click to edit Master title style! !<  Hgֳgֳ ?"  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  Ngֳgֳ ?"`p  Z*    Ngֳgֳ ?"`   \*     Ngֳgֳ ?"`@  \*   N  6n޽h? ? www3ff $Blank Presentation1  - 2003 WL Truppel ZCS 12: Intro. Computer Science II " Lecture 2 +#  ( |  B  N1?"442  N?"! :    Ngֳgֳ ?"` D T Click to edit Master title style! !  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