*A NICE PROGRAM TO ENTER THE COMMENT WHICH IS SAVED INTO SOME FILE & READ THAT COMMMENT

/*A NICE PROGRAM TO ENTER THE COMMENT WHICH IS SAVED INTO SOME FILE & READ THAT COMMMENT*/

#include<stdio.h>

#include<fcntl.h>

#include<string.h>

int main()

{

        int count,wfd,fd;

        char arr[100],usr[4];

        //memset(,'\0',sizeof());

        wfd=open("./anu",O_WRONLY|O_CREAT|O_TRUNC);//open THE FILE INTO WHICH COMMENT IS TO BE SAVED..IN O_WRONLY MODE..& CLEAR ALL THE DATA INTO FILE BY USING O_TRUNC...SO THAT COMMENT SHOULD NOT BE OVERRITTEN ...NEW COMMENT SHOULD BE RECEIVEDBY REMOVING PREVIOUS COMMMENT..//

        printf("ENTER THE COMMENT:\n");

        scanf("%[^\n]",arr);//ENTER THE CHARACTERS OF COMMMENT USING SCANF...^\n will MAKE ABLE TO SCANF TO LEAVE THE SPACE BETWEEN THE CHARACTERS...//

        write(wfd,arr,strlen(arr));//WRITE ALL CHARACTERS OF ARRAY INTO FILE ...WHERE THAT COMMENT IS SAVED//

        printf("DO U WANT TO READ,,ENTER THE COMMAND:\n");

        scanf("%s",usr);//ENTER read ...if u want to read the COMMENT...//

        if(strncmp(usr,"read",4)==0)//COMPARE IF USR HAD ENTER READ COMMAND...//

        {

                fd=open("./anu",O_RDONLY);//OPEN same file anu in O_RDONLY MODE//

                printf("fd=%d\n",fd);

                lseek(fd,0,SEEK_SET);//SET POSITION OF CURSER AS 0..//

                memset(arr,'\0',sizeof(arr));//MEMSET ARRAY BY 0

                count=read(fd,arr,sizeof(arr));//READ ALL THE CHARACTERS FROM fd TO arr

                printf("count=%d\n",count);

                printf("%s",arr);//print that value which is into that array...//

//SO YOUR MESSAGE IS PRINTED ..//

        }

        return 0;

}