CS241
Introduction To C
Lawrence Angrave
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C Programming: Identifiers, Linkage, and Storage Classes, Study notes of Computer Science
An introduction to the c programming language, focusing on identifiers, linkage, and storage classes. Topics covered include the difference between external and internal linkage, static and automatic storage classes, and the use of static variables. The document also touches upon the c compiler and its options, as well as pointers and argument arrays.
Typology: Study notes
Pre 2010
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CS
Introduction To C Lawrence Angrave
Crash course in C
char * search(char*) { char result[100]; … do stuff return result; }
static int debug=1; main(…) { }
Linkage & Scope
Linkage
Identifiers (variables & functions) visible to another c file? Main.c = Compilation unit Myutils.c = Another compilation unit Static : No!
main.c
Refer to runsuperfast and die? extern int runsuperfast; void die(char *mesg);
main.c
Refer to runsuperfast and die? void die(char *); // declaration! extern int runsuperfast;
C Compiler
gcc Gnu Compiler
Many options! man gcc Three for the price of one Preprocessor Compiler Linker
Pointers
Pointers
How to shoot yourself in the foot and not realize it
int *p
What is the value of p == &*p; p[0] == *p
char **argv
Explain this to your neighbor