K. Srinivasa Chary wrote:
> char *s="",t;
>
>
...
> scanf("%s",s);
>
You haven't really provided a place for scanf to store its output.
char *s="";
Makes s equal to a pointer to a single byte of 0 stored somewhere in
memory (potentially shared with "" or even other strings elsewhere in
your program). It is NOT a buffer you are permitted to overwrite.