ISO - OSI Model

/* Draw ISO - OSI Model using C */

#include< stdlib.h>
#include< graphics.h>
#include< conio.h>
#include< stdio.h>

void main()
{
int driver, mode;
int i,j;
driver = DETECT;
initgraph(&driver,&mode,"");

outtextxy(250,450,"ISO OSI Model");
delay(2000);
outtextxy(90,30,"Sender");
delay(500);
setcolor(6);
for(i=50;i< =350;i+=50)
{
rectangle(200,i,50,i+30);
delay(500);
}
setcolor(10);
outtextxy(70,60,"Application");
delay(500);
outtextxy(70,110,"Presentation");
delay(500);
outtextxy(70,160,"Session");
delay(500);
outtextxy(70,210,"Transport");
delay(500);
outtextxy(70,260,"Network");
delay(500);
outtextxy(70,310,"Data Link");
delay(500);
outtextxy(70,360,"Physical");
delay(500);
setcolor(15);
outtextxy(390,30,"Receiver");
delay(500);
setcolor(6);
for(i=50;i< =350;i+=50)
{
rectangle(350,i,500,i+30);
delay(500);
}
setcolor(10);
outtextxy(370,60,"Application");
delay(500);
outtextxy(370,110,"Presentation");
delay(500);
outtextxy(370,160,"Session");
delay(500);
outtextxy(370,210,"Transport");
delay(500);
outtextxy(370,260,"Network");
delay(500);
outtextxy(370,310,"Data Link");
delay(500);
outtextxy(370,360,"Physical");
delay(500);
// sender Lines
line(120,80,120,100);
delay(500);
line(120,130,120,150);
delay(500);
line(120,180,120,200);
delay(500);
line(120,230,120,250);
delay(500);
line(120,280,120,300);
delay(500);
line(120,330,120,350);
delay(500);
line(120,380,120,400);
delay(500);
// Physical Connection
line(120,400,420,400);
// Receiver Lines
line(420,380,420,400);
delay(500);
line(420,330,420,350);
delay(500);
line(420,280,420,300);
delay(500);
line(420,230,420,250);
delay(500);
line(420,180,420,200);
delay(500);
line(420,130,420,150);
delay(500);
line(420,80,420,100);
//virtual connection
setcolor(15);
delay(500);
outtextxy(210,35,"Virtual Connection");
delay(1000);
for(j=65;j< =365;j+=50)
{
for(i=0;i< 15;i++)
{
setcolor(i);
line(200,j,230,j);
delay(10);
line(235,j,265,j);
delay(10);
line(270,j,300,j);
delay(10);
line(305,j,335,j);
delay(10);
line(340,j,350,j);
delay(10);
}
}
delay(500);
}
/*

*/

PC to PC Communication using RS-232

/*Aim: PC to PC Communication using RS-232 in 'C'. */

#include
#include
#define COM1 0
#define DATA_READY 0x100
#define SETTINGS ( 0x80 | 0x02 | 0x00 | 0x00)
int main(void)
{
int in, out, status;
bioscom(0, SETTINGS, COM1); /*initialize the port*/
cprintf("Data sent to you: ");
while (1)
{
status = bioscom(3, 0, COM1); /*wait until get a data*/
if (status & DATA_READY)
if ((out = bioscom(2, 0, COM1) & 0x7F) != 0) /*input a data*/
putch(out);
if (kbhit())
{
if ((in = getch()) == 27) /* ASCII of Esc*/
break;
bioscom(1, in, COM1); /*output a data*/
}
}
return 0;
}

/* OUTPUT:-
Data sent to you: HI...how are you??
*/

Calculation Of CRC

/* Calculation of CRC (Cyclic Redundancy Check)*/

#include< stdlib.h>
#include< conio.h>
#include< stdio.h>
void main()
{
int i,j,n,g,a,arr[20],gen[20],b[20],q[20],s;
clrscr();
printf("Transmitter side:");
printf("\nEnter no. of data bits:");
scanf("%d",&n);
printf("Enter data:");
for(i=0;i< n;i++)
scanf("%d",&arr[i]);

printf("Enter size of generator:");
scanf("%d",&g);
do{
printf("Enter generator:");
for(j=0;j< g;j++)
scanf("%d",&gen[j]);

}
while(gen[0]!=1);
printf("\n\tThe generator matrix:");
for(j=0;j< g;j++)
printf("%d",gen[j]);

a=n+(g-1);
printf("\n\tThe appended matrix is:");
for(i=0;i< j;++i)
arr[n+i]=0;

for(i=0;i< a;++i)

printf("%d",arr[i]);

for(i=0;i< n;++i)
q[i]= arr[i];

for(i=0;i< n;++i)
{
if(arr[i]==0)
{
for(j=i;j< g+i;++j)
arr[j] = arr[j]^0;
}
else
{
arr[i] = arr[i]^gen[0];
arr[i+1]=arr[i+1]^gen[1];
arr[i+2]=arr[i+2]^gen[2];
arr[i+3]=arr[i+3]^gen[3];
}
}
printf("\n\tThe CRC is :");
for(i=n;i < a;++i)
printf("%d",arr[i]);
s=n+a;
for(i=n;i< s;i++)
q[i]=arr[i];
printf("\n");
for(i=0;i< a;i++)
printf("%d",q[i]);
getch();
}
/* Output

Transmitter side:
Enter no. of data bits:8
Enter data:1 0 1 0 0 0 0 1
Enter size of generator:4
Enter generator:1 0 0 1

The generator matrix:1001
The appended matrix is:10100001000
The CRC is :111
10100001111
*/