A PROGRAM TO COMPARE 2 FILES & ENTER THE DIFFRENCE OF CHARACTERS IN 2 FILES INTO 3RD FILE

/*A PROGRAM TO COMPARE 2 FILES & ENTER THE DIFFRENCE OF CHARACTERS IN 2 FILES INTO 3RD FILE*/

#include<stdio.h>

#include<fcntl.h>

int main()

{

char buff,set;

int fd1,fd2,wfd,count1=1,count2=1;

fd1=open("source1",O_RDONLY);//OPEN 1ST FILE TO READ

fd2=open("source2",O_RDONLY);//OPEN 2ND FILE TO READ

wfd=open("desti",O_WRONLY|O_CREAT);//OPEN  3RD FILE ..TO WRITE..& ALSO CREAT 3RD FILE..IN WHICH DIFFRENCE BETWEEN CHARACTERS OF 2 FILES MAY BE WRITTEN //

while(count1==1 && count2==1)// IF THERE IS ANY CHARACTER TO READ..THEN count1=1 & also count2=1

{

count1=read(fd1,&buff,1);//UNTILL IN ANY FILE ...THERE IS ANY CHARACTER TO READ THEN READ THAT CHARACTER& CHECK DIFFRENCE

count2=read(fd2,&set,1);

if(buff != set)//IF CHARACTER READ FROM 1ST FILE IS DIFFRENT THAN CHARACTER READ FROM 2ND FILE ...THEN THAT DIFFRENT LETTER OR CHARACTER IS PUT INTO 3RD FILE ..//

{

write(wfd,&buff,1);//3RD FILE ..//

}

}

return 0;

}

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