Basics for embedded systems

Basics for embedded systems:

C program:

Structure of C program:

• include files
• global variables and function declaration
• main function
• function and program.

Including files are including the preprocessed files like;eg:#include<stdio.h>,#include<conio.h>.
Global variables are those variables declared globally in the sense before a main function.After the main fuction the program consists of sub programs.

There are keywords used for performing specific operation.
eg:auto,break,case,double,int,char,const,signed,unsigned,void,etc;..

Data types:

1. Primary/primitive data types:

• Integer
• char
• float
• void

   2.   Derived data types:

• Array
• pointer

   3.   User defined data types:

• structure
• union
• enum
• type def

Variable:
type            size
char           1byte
int              2bytes
float           4bytes
double        8bytes

There are also modifiers,compilers,constants,operators,relational operators,statements,break statements,switch and case statements any many more.