#include<unistd.h>
#include<stdio.h>
#include<fcntl.h>
#include<string.h>
int main(){
    int fd;
    char buffer[100];
    char text[]="Hello, this is a file system call example.\n";
    fd=open("example.txt",O_CREAT | O_WRONLY, 0644);
    write(fd,text,strlen(text));
    close(fd);
    fd=open("example.txt",O_RDONLY);
    read(fd,buffer,sizeof(buffer));
    printf("File contents:\n%s",buffer);
    close(fd);
    return 0;
}