One global shared i. Each instance has its ‘own’ j. Instance Variables: Structs in C: • Similar to objects in Java, fields are stored contiguously in memory. BUT: structs don’t have instance methods, just data fields • Similar to arrays, structs can be allocated statically or dynamically. • To access an instance variable: need a […]
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“Pascal [Java] is for building pyramids – imposing, breathtaking, static structures built by armies pushing heavy blocks into place. Lisp [Haskell] is for building organisms – imposing, breathtaking, dynamic structures built by squads fitting fluctuating myriads of simpler organisms into place. … the pyramid must stand unchanged for a millennium; the organism must evolve or
Creating Function Pointers in C Given the following functions, declare function pointers that point to them and include a sample call to each Convert Java instance-method call into equivalent C code that uses function pointers void pong(int i) { printf(“pong: %d\n”, i); } int pong_ret(int i) { printf(“pong: %d\n”, i); i++; return i; } Polymorphism
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CPSC 213 Introduction to Computer Systems Winter Session 2020, Term 2 Unit 2c – Mar 29 Synchronization Overview ‣ Reading • text: 12.4-12.6, parts of 12.7 ‣ Learning Goals • explain the relationship between concurrency, shared data, critical sections and mutual exclusion • use locks to guarantee mutual exclusion in C programs • identify race
CPSC 213 Introduction to Computer Systems Winter Session 2020, Term 2 Unit 2a – Mar 17 I/O Devices, Interrupts and DMA Overview ‣ Reading in Text • 8.1, 8.2.1, 8.5.1-8.5.3 ‣ Learning Goals • Explain what PIO is, why it exists, what processor originates it, and how it is used • Explain what DMA is,
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“Pascal [Java] is for building pyramids – imposing, breathtaking, static structures built by armies pushing heavy blocks into place. Lisp [Haskell] is for building organisms – imposing, breathtaking, dynamic structures built by squads fitting fluctuating myriads of simpler organisms into place. … the pyramid must stand unchanged for a millennium; the organism must evolve or
. CPSC 213 – 2018 Winter Term 2 Exam Review: Function pointers and switch statements 1 [12 marks] Static and Dynamic Procedure Calls. 1a ProcedurecallsinCarenormallystatic.MethodinvocationsinJavaarenormallydynamic.Carefullyexplain the reason why Java uses dynamic method invocation and what benefit this provides to Java programs. 1b CarefullyexplainanimportantdisadvantageofdynamicinvocationinJavaorotherlanguages. 1c DemonstratetheuseoffunctionpointersinCbywritingaprocedurecalledcomputethat: 1. has three arguments: a non-empty array of integers, the
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Creating Function Pointers in C Given the following functions, declare function pointers that point to them and include a sample call to each Convert Java instance-method call into equivalent C code that uses function pointers void pong(int i) { printf(“pong: %d\n”, i); } void (*a_param_func) (int); a_param_func = pong; a_param_func (3); int pong_ret(int i) {
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Memory Deallocation In C, malloc(n) allocates n bytes of memory and returns the address. int *x = malloc(n); Free releases the memory immediately. For example, free(x): de-allocates the memory block beginning at address x memory block can later be allocated (by later malloc) does NOT change the value at address pointed to
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“Learn at least a half dozen programming languages. Include one language that emphasizes class abstractions (like Java or C++), one that emphasizes functional ab- straction (like Lisp or ML or Haskell), one that supports syntactic abstraction (like Lisp), one that supports declar- ative specifications (like Prolog or C++ templates), and one that emphasizes parallelism (like