MSL2009. C language

C language

Juan A. Suárez Romero

Master on Free Software

List of topics

● History
● Control structures
● Data types
● Operators
● Preprocessor


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


Example
#include <stdio.h>

int main(int argc, char *argv[])
{
printf (“Hello, world!n”);

return 0;
}


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;

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];
}


Data types
struct email {
int sent_date;
char *sender;
char *subject;
char *content;
};

struct email *myemail;


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)


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


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


Functions
int multiply (int n1, int n2);

int multiply (int n1, int n2)
{
return n1*n2;
}


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


MSL2009. C language

Recommended

Recommended

More Related Content

Viewers also liked

Viewers also liked (6)

More from Juan A. Suárez Romero

More from Juan A. Suárez Romero (17)

Recently uploaded

Recently uploaded (20)

MSL2009. C language