1. C Language
By Sra Sontisirikit

2. Background of C language
C is high level language create in 1972
By Brian W. C. Kernighan & Dennis M. Ritchie
Based on two languages : BCPL and B
Brian Kernighan
Dennis Ritchie

3. Goals and Purpose Straightforward language
Provide low-level access to memory
Require minimal run-time support

4. Language Structure and Syntax
A C program basically has the following form:
Preprocessor Commands The preprocessor is a program that is invoked by the compiler to process code before compilation.
Type definitions
Function prototypes -- declare function types and variables passed to function.
Variables
Functions

5. type function_name (parameters){
local variables  
C Statements   }

6. Language Structure and Syntax
This is simple program that will print a String #include <stdio.h> int main() { printf("This is my first program in C.\n"); return 0; }

7. #include <stdio.h> int main() {...} printf(...)
This line call "Compiler Directives" to command program to compile file "stdio.h", that use for call method printf.
int main()
The line int main() declares the main function. Every C program must have a function named main somewhere in the code.
{...}
The { and } symbols mark the beginning and end of a block of code. In this case, they are for the main method to contain the statements.
printf(...)
The printf statement is called the format string. It can contain a string such as "This is my first program in C.". And the "/n" symbol is to move the print position to the next line.
return 0;
This line means the function is ended.

8. Variables

9. Features of the language
Small size
Extensive use of function calls
Loose typing -- unlike PASCAL
Structured language
Low level programming readily available
Pointer implementation - extensive use of pointers for memory, array, structures and functions.