Checksums program in C

Checksum sender.c

#include<stdio.h>

#include<stdlib.h>

#include<unistd.h>

#include<sys/stat.h>

#include<fcntl.h>

#include<string.h>

unsigned char getCheckSum(unsigned char a,unsigned b){

char flag=0;

unsigned char carry=a&b;

unsigned char result=a^b;

unsigned char carryout=0;

while(carry!=0){

if(carry>=128)

flag=1;

carryout =carry<<1;

carry=result & carryout;

result=result^carryout;

}

if(flag==1){

result=getCheckSum(result,1);

}

return result;

}

int main(){

int i,pid;

pid=open("MyPipe",O_WRONLY);

unsigned char data[10]={'\0'};

unsigned char chksum='\0';

system("clear");

printf("Enter data");

scanf("%s" ,data);

chksum=data[0];

for(i=1;data[i];i++){

chksum=getCheckSum(chksum,data[i]);

}

printf("%d = %d = %c",chksum,~chksum,~chksum);

data[i]=~chksum;

data[i+1]='\0';

printf("chksum = %d Sending is %s ",
data[strlen(data)-1],data);

write(pid,data,sizeof(data));

}

rece.c

#include<stdio.h>

#include<stdlib.h>

#include<unistd.h>

#include<sys/stat.h>

#include<fcntl.h>

#include<string.h>

unsigned char getCheckSum(unsigned char a,unsigned b){

char flag=0;

unsigned char carry=a&b;

unsigned char result=a^b;

unsigned char carryout=0;

while(carry!=0){

if(carry>=128)

flag=1;

carryout =carry<<1;

carry=result & carryout;

result=result^carryout;

}

if(flag==1){

result=getCheckSum(result,1);

}

return result;

}

int main(){

int i,pid;

//

unsigned char data[10]={'\0'},string[10]={'\0'};

unsigned char chksum='\0';

int len;

unsigned char send_chksum='\0';

system("clear");

mkfifo("MyPipe",0666);

pid=open("MyPipe",O_RDONLY);

read(pid,data,sizeof(data));

send_chksum=data[strlen(data)-1];

len=strlen(data);

printf("received data is %s and length is %d,chksum =%d",
data,len,data[strlen(data)-1]);

for(i=0;strlen(data)-1;i++){

chksum=getCheckSum(chksum,data[i]);

string[i]=data[i];

}

chksum=~chksum;

printf("\nSending is %s ",string);

if(send_chksum==chksum){

printf("\ndata is accurate");

}else{

printf("\ndata is not accurate");

}

unlink("MyPipe");

return 0;

}