Why are there so few CS / IS majors?? "Software is hard," reads the quote that opens Dreaming in Code. Why do most projects end up over-budget or cancelled or both? Why can't we ship code without bugs? Why can't we build software the same way we build bridges? Software Disasters Readable => Understandable => Maintainable YOU'LL be doing CODE like this: Arrays: classes and objects Sum with parameters and return Sum Range finds sum of numbers within range Day One Quiz (C#)

Fundamentals and 202 Review Create Console Programs Example Console Programs

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We review/expand/enhance/complete/remember ideas from 202. We learn that methods are key to code organization in 244. Console Progarms vs. Windows. Write code from scratch (notepad++)

IsEven finds if number is even: overloaded IsPerfect finds if number is a perfect square Params: out, ref, named, default/optional ref: Method Examples: web, recursive, fade

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We understand what a signature is and why it is important. We understand return values. We understand parameter variations: by value, by reference, optional, by name We understand the important difference between reference, out and value params and how to specify. We understand events, delegates and event wiring. We can create and call methods.

Syntax, Run-time & Logic Errors ; Debug; Validation web, errors, timing, methods References: MSDN C# Reference MSDN C# Programming Guide C# Reference

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We can use "#define DEBUG" (default) and "#undef DEBUG" for conditional compilation. We can use #if DEBUG & #endif to conditionally compile (& execute) code. We can debug using breakpoints and stepping into and stepping through code. We can examine the value of variables as code executes in debug. We know where to look for help.

Console Snake (& enum) Array: a "Collection" of objects of the same type Arrays as parameters CODE: Stopwatch: timing, arrays, methods, params 2-d arrays and nested loops List<T> , generics and collections

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We can create a console program. We understand that Console.WriteLine() & Console.ReadLine() are the primary I/O methods. We understand the difference between static methods (class) and instance methods (object). We can create, execute and debug console programs. int y; // a value variable stored statically on the stack int[] x; // a reference variable that references an array x = new int[10]; // references dynamic memory from the "heap" x[0] = 99; // assign a value Arrays are 'immutable' Pass arrays as parametrs Pass params by reference

** Random Numbers in a Row - no repeats ** 2-d array jagged vs square with separate Nums class ** 2-d array creating & printing random 9x9 ** Notepad and CSC Compile

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We can use arrays to solve problems

Creating & using a library - DLL Classes: instantiating an object creates a reference ** Separate 'Nums' class with 2d array jagged square

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Create library Create new class static class method dynamic instance method

Structs and arrays of structs Recursion: methods calling themselves Delegates & Windows Forms from Console Threads

TEST 1 Review Create a CAP