Strings in C CSE 2421 C does not have a string data type. In C, strings are stored as sequences of characters in memory (i.e. a character array). The individual characters will always be stored in contiguous bytes in memory. There are two different kinds of data “strings” in C: 1. Strings […]
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Scope C Storage Class, Scope, and Linkage Recommended Reading: Pointers On C, Chapter 3, Sections 3.5 through 3.10 with a special interest in Table 3.4. Storage class: 4 types (only 3 really) ◦ static ◦ automatic (or auto) ◦ register ◦ external (not really storage class, but linkage) Storage Scope: 4 types (we
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Pointers part 1 C Pointers – Part 1 Recommended Reading: Pointers on C, Beginning of Chapter 3 through Section 3.1.3 POINTERS ◦ At last, we arrive at THE MOST DREADED WORD in the lexicon of the C programming student. Pointers are indeed so dreaded that Java has completely done away with pointers and wrapped
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Intro to C CSE 2421 • C is procedural, not object-oriented • C is fully compiled (to machine code), not to byte-code • C allows direct manipulation of memory (via pointers) • C does not have garbage collection; the software writer has to do explicit memory management when it is required, and failure to do
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Pointers & Arrays C Pointers – Part 2 Arrays and pointers ◦ Statically allocated arrays ◦ Dynamically allocated arrays Pointers to void (void *) Dynamic memory allocation and pointers Freeing (deallocating) dynamically allocated storage Pointer arithmetic Function parameters and pointers Different from arrays in Java in a number
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Unix/Linux CSE 2421 Developed from 1969-1971 at AT&T Bell Laboratories (Ken Thompson/Dennis Ritchie/Brian Kernighan/Douglas McIIroy/Joe Ossanna) Written largely in C (some assembly language code as well) C was originally developed as a programming language to write the Unix OS, which was a multi-user, multi-tasking OS. Proprietary (requires a license for use)
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The University of Melbourne School of Computing and Information Systems COMP30026 Models of Computation Sample Answers to Tutorial Exercises, Week 1 T1.3 Card 3 cannot be red, because red cannot lie, and Card 3 says it is the joker. So suppose Card 2 is red. Then Card 1 is black and Card 3 is the
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• System software serves three purposes – virtualization – protection – abstraction (particularly hiding asynchrony) • virtualization: – the illusion of multiple/practically unlimited resources • protection: – reduce/eliminate the chance of accidental and/or malicious destruction of data/results by another program Role of System Software (1) • abstraction: – hide fundamentally asynchronous nature of processor/device interaction
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Control Structures The C Language – Part 3 Loop constructs in C ◦ for loops ◦ while loops ◦ do while loops ◦ break and continue Conditional statements in C ◦ if ◦ switch-case Boolean issues The comma operator Enumerated data types for (expression1; expression2; expression3) { statement(s); } while
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Pointers part 2b Suppose we request enough space from malloc() or calloc() to store more than one variable of some type, and assign some value to the first element in the allocated memory: int *p; p = malloc (10 * sizeof(int)); *p = 100; /* assigns 100 to the first sizeof (int) bytes */
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