MSL2009. C language

C language Juan A. Suárez Romero Master on Free Software

List of topics ● History ● Control structures ● Data types ● Operators ● Preprocessor Master on Free Software

History ● Developed by Dennis Ritchie ● Goal: port a SO from PDP-7 to PDP-8 ● K&R C ● Ansi C (C89/C90 - C99) Master on Free Software

Example #include <stdio.h> int main(int argc, char *argv[]) { printf (“Hello, world!n”); return 0; } Master on Free Software

Control structures while (condition) statement_set; do statement_set while (condition) for (initial_cond, final_cond, change_action) statement_set if (condition) st_set else st_set2; Master on Free Software

Data Types ● Simple types – char, int, float, double – signed/unsigned ● Complex types – arrays, structures, unions – strings (arrays of char ended in NULL) ● 'Special' types – Pointers – Void Master on Free Software

Data types #include <stdio.h> int main(int argc, char *argv[]) { char letter; double pi; float height; int first_prime_numbers[30]; } Master on Free Software

Data types struct email { int sent_date; char *sender; char *subject; char *content; }; struct email *myemail; Master on Free Software

Arrays / pointers ● Array is actually a pointer to a chunk of memory ● Uses of * and & char *a; char b; *a?? &b?? (a = &b)?? (b = *a)?? ● Pointer arithmetic: a[3] == *(a+3) Master on Free Software

Operators ● Arithmetic (+, -, *, /, %) ● Logical (&&, ||, ==, !=, >=, <=) ● Increment / Decrement ● Size of a type ● Self assignment (+=, -=, ...) Master on Free Software

Preprocessor ● Definitions – #define, #undef ● Conditional compiling – #if, #ifdef, #ifndef, #else, #endif ● Include other files – #include Master on Free Software

Functions int multiply (int n1, int n2); int multiply (int n1, int n2) { return n1*n2; } Master on Free Software

References ● The C Programming Language (2nd edition) – Brian W. Kernighan – Dennis M. Ritchie Master on Free Software

MSL2009. C language

by Juan A. Suárez Romero on Feb 11, 2010

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MSL2009. C language — Presentation Transcript