AS4

#include<sys/file.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<unistd.h>
#include<stdio.h>
int main()
{
  char t[100],f[30];
  int fd;
  printf("Enter file name: ");
  scanf("%s",f);
  fd=open(f,O_RDWR,S_IRWXU);
  if(fd==-1)
  {
    fd=creat(f,S_IRWXU);
    if(fd==-1)
      return 1;
    printf("Empty file created\n");
  }
  else
  {
    int len=read(fd,t,100),i;
    printf("\nFile contents:\n");
    for(i=0;i<len;++i)
      putchar(t[i]);
    printf("\n");
  }
  close(fd);
  return 0;
}