Write a C program for PC to PC communication.

Full duplex character transfer (chat application)

#include<stdio.h>

#include<conio.h>

#include<dos.h>

#include<process.h>

#include<string.h>

union REGS in,out;

void init();

void transmit(char str);

void recive();

void main()

{

int ch,i,n=0;

char string[10],c1;

clrscr();

init();

do

{

printf("\nMENU");

printf("\n1.Transmit");

printf("\n2.Recive");

printf("\nEnter your choice=");

scanf("%d",&ch);

switch(ch)

{

case 1:

      printf("\nEnter data to transmit=");

      scanf("%s",&string);

      n=strlen(string);

      for(i=0;i<n;i++)

      {

transmit(string[i]);

      }

      transmit('\0');

      break;

case 2:

printf("\nRecived data is =");

recive();

break;

}

     printf("\nDo you want to continue(y/n)=");

     flushall();

     scanf("%c",&c1);

}while(c1=='y');

getch();

}

void init()

{

in.h.ah=0x0;

in.h.al=0xe3;

in.h.dh=0x0;

in.h.dl=0x0;

int86(0x14,&in,&out);

}

void transmit(char str)

{

in.h.ah=0x1;

in.h.al=str;

in.h.dh=0x0;

in.h.dl=0x0;

int86(0x14,&in,&out);

 if(out.h.ah && 0x01==1)

printf("\nData trasnmitted successfully");

 else

printf("\nError in data transmission");

}

void recive()

{

char c;

in.h.ah=0x2;

in.h.dh=0x0;

in.h.dl=0x0;

int86(0x14,&in,&out);

c=out.h.al;

if(c!='\0')

{

printf("%c",c);

      recive();

}

}

COMPUTER 1

****************OUTPUT*********************

MENU
1.Transmit
2.Recive
Enter your choice=1

Enter data to transmit=mmcoe

Data trasnmitted successfully
Data trasnmitted successfully
Data trasnmitted successfully
Data trasnmitted successfully
Data trasnmitted successfully
Data trasnmitted successfully
Do you want to continue(y/n)=y

MENU
1.Transmit
2.Recive
Enter your choice=2

Recived data is =prasad
Do you want to continue(y/n)=n

COMPUTR 2

****************OUTPUT*********************

MENU
1.Transmit
2.Recive
Enter your choice=2

Recived data is=mmcoe
Do you want to continue(y/n)=y

MENU
1.Transmit
2.Recive
Enter your choice=1

Enter data to transmit=prasad

Data trasnmitted successfully
Data trasnmitted successfully
Data trasnmitted successfully
Data trasnmitted successfully
Data trasnmitted successfully
Data trasnmitted successfully
Data trasnmitted successfully
Do you want to continue(y/n)=