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1. EMBEDDED SYSTEM

2. What is embedded system?

3. It is a combination of hardware and
software.
Some of the applications are for
example:
washing machine
digital watches
Ipod’s and etc..

4. What are the types of
embedded system?

5. Three types of embedded system’s are:
 Small scale embedded system
- digital watches
 Medium scale embedded system
- Ipod’s
 Large scale embedded system
- washing machine

6. What are the languages used in
embedded c?

7. INTRODUCTION OF C
LANGUAGES

8.  The C programming language was designed by
Dennis Ritchie at Bell Laboratories in the early
1970s
 Influenced by
◦ ALGOL 60 (1960),
◦ CPL (Cambridge, 1963),
◦ BCPL (Martin Richard, 1967),
◦ B (Ken Thompson, 1970)
 Traditionally used for systems programming,
though this may be changing in favor of C++

9. SOFTWARE
Two types of software's are used
1. Application software
2. Program software
the program s/w will create application
wise program and create normal program
also. Like c, c++,java,and visual basics.

10. Pre
processor
linker assembler
compiler

11. The Preprocessor
◦ #define : defines a macro
◦ #undef : removes a macro definition
◦ #include : insert text from file
◦ #if : conditional based on value of expression
◦ #ifdef : conditional based on whether macro
defined
◦ #ifndef : conditional based on whether macro
is not defined
◦ #else : alternative
◦ #elif : conditional alternative

12. Example program:
#include<stdio.h>
#include<conio.h>
Void main()
{
Printf(“A PLUS CADD”);
}
Getch();

13. CHARACTER SETS OF C
 Alphabets
single character ‘a’ or string ‘abc’.
 Numbers
int, float, long
 Special characters
: ; “ ‘ , & # * @

14. KEYWORDS
32 keywords
 Int
 float
 If
 If else
 For
 Exit
 Continue

15. VARIABLE and DATA TYPES
 Variable is used to store several values.
 DATA TYPE
character- “char”
integer - “int”
float - “f”

16. TYPES OF OPERATORS
 Arithmetic operators(+ - * / %)
 Relational operator(==,<=,>=,<,>,!=)
 Logical operator(&&,||, ~)
 Assignment operator
 Inc/dec operator(pre,post)
 Conditional operator(check condition)
 Bitwise operator(right and left shift)
 Precedence operator(priority based)

17. INPUT AND OUTPUT SYSTEM
Unformatted formatted
Input output scanf and printf
Getchar() putchar()
Getch() putch()
Getc() putc()
Gets() puts()

18. Examples
 Scanf syntax:
(“control string”,&v1,&v2);
example
scanf(“%d”, &a &b);
 Printf syntax:
(“control string”,&v1,&v2”);
example
printf(“result %d”,a);

19. SPECIFIERS
%c single character
%d decimal integer
%s string
%f,%e float value
%ld long integer
%o octal number
%x hexa decimal number
%h short integer

20. CONTROL STATMENTS
 If
 If else
 If else if
 Switch case
LOOPING
For
while
do while
 GOTO

21. IF CONDITION
Syntax: example:
If(condition) if(y%2==0)
{ {
Statement; printf(“even no”)
} }

22. IF ELSE CONDITION
Syntax: example:
If(condition) if(y%4==0)
{ {
Statement; printf(“leap year”);
} }
Else else
{ {
Statement; printf(“non leap year”);
} }

23. NESTED IF
SYNTAX:
if(condition 1)
{
if(condition 2)
{
statement;
}
Else
{
If(condition 3)
{
Statement;
}

24. Example program
Main()
{
Int a=1,b=2,c=3,d=4;
If(d>c)
if(c>d)
Printf(“%d%d”,d,c);
If(c>a)
Printf(“%d%d,c,d);
If(c>a)
If(b>a)
Printf(“%d%d”,c,a);
If(b>c)
Printf(“%d%d”,b,c);
Return(0);
Getch();
}

25. IF ELSE LADDER
SYNTAX:
if(condition 1)
{
statement;
}
Else if
{
If(condition 2)
{
Statement;
}
Else
{
Statement;
}

26. Example program
If(a<b & b<c & c<d)
{
Printf(“%d”,a);
{
Else if(b<c & c<d)
{
Printf(“%d”,b);
}
Else if(c<d)
{
Printf(“%d”,c);
}
Else
{
Printf(“%d”,d);
}
Getch();
}
Example program to find smallest number

27. LOOPING STATEMENT
WHILE LOOP (entry control loop)
Syntax:
while(condition)
{
Statement;
}

28. Example program
#include<stdio.h>
Void main()
{
Int i;
i=0;
While(i<10)
{
Printf(“%d”,i);
i++;
}
}

29. LOOPING STATEMENT
DO WHILE LOOP (exit control loop)
Syntax:
do
{
Statement;
}
while(condition)

30. Example program
#include<stdio.h>
Void main()
{
Int i;
i=0;
Do
{
Printf()
Scanf(“%d”,i);
i++;
}
While(i<10);
}