Reading Junk Characters at end into buffer from file ?

Are you getting junk characters at the end of the buffer like Íýýýý««««««««þîþ or ²²²²½½½½½½½½ε■ε■ ? recently i wanted to read flat file using C while i was reading the file i was getting some junk at the end as said above as i am new to C programming as my main domain DotNet i was very much puzzled and after R&D i came to know what was the problem and fixed it...

FILE *fp;
long len;
char *buff;
fp=fopen("output.txt","rb");
fseek(fp,0,SEEK_END);
len=ftell(fp);
rewind(fp);
buff = NULL;
buff=(char *)malloc(len+1);
fread(buff,len,1,fp);
printf("Output is : %s",buff);
free(buff);
fclose(fp);

When we copy or read data from a file to char buffer it does not copy the terminating null so when you display the buffer, the display will continue forever running through memory until a \0 is encountered.

so easy fix is to add buff[len] = '\0'; at the end

FILE *fp;
long len;
char *buff;
fp=fopen("output.txt","rb");
fseek(fp,0,SEEK_END);
len=ftell(fp);
rewind(fp);
buff = NULL;
buff=(char *)malloc(len+1);
buff[len] = '\0';
fread(buff,len,1,fp);
printf("Output is : %s",buff);
free(buff);
fclose(fp);

The above code will copy the contents of the file to a single string buffer, so any comments on above code welcomed.