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Ebook Cracking the coding interview: Part 2

(BQ) Part 2 book "Cracking the coding interview" has contents: Low level, threads and locks, system design and memory limits, networking, moderate, hard, databases,. and other contents. | Part 3 Knowledge Based Chapter 13 | C++ How To Approach: A good interviewer won’t demand that you code in a language you don’t profess to know. Hopefully, if you’re asked to code in C++, it’s listed on your resume. If you don’t remember all the APIs, don’t worry—your interviewer probably doesn’t care that much. We do recommend, however, studying up on basic C++ syntax. Pointer Syntax 1 2 3 4 5 int p = v = Foo int *p; // Defines pointer. &q; // Sets p to address of q. *p; // Set v to value of q. *f = new Foo(); // Initializes f. k = f->x; // Sets k equal to the value of f’s member variable. C++ Class Syntax 1 2 3 4 5 6 7 8 9 10 11 class MyClass { private: double var; public: MyClass(double v) {var = v; } ~MyClass() {}; double Update(double v); }; double Complex::Update(double v) { var = v; return v; } C++ vs Java A very common question in an interview is “describe the differences between C++ and Java.” If you aren’t comfortable with any of these concepts, we recommend reading up on them. 1. Java runs in a virtual machine. 2. C++ natively supports unsigned arithmetic. 3. In Java, parameters are always passed by value (or, with objects, their references are passed by value). In C++, parameters can be passed by value, pointer, or by reference. 4. Java has built-in garbage collection. 5. C++ allows operator overloading. 6. C++ allows multiple inheritance of classes. Question: Which of these might be considered strengths or weaknesses of C++ or Java? Why? In what cases might you choose one language over the other? 75 Cracking the Coding Interview | Knowledge Based Chapter 13 | C++ 13.1 Write a method to print the last K lines of an input file using C++. _pg 215 13.2 Compare and contrast a hash table vs. an STL map. How is a hash table implemented? If the number of inputs is small, what data structure options can be used instead of a hash .