Question { Mphasis, 11108 }

please tell me the logic for this C program :
INPUT (string):ABCD

OUTPUT :BCDA
CDAB
DABC

Answer

char str[]="ABCD";
len = strlen(str);
for (i=1; i < len; ++i )
{
j=i;
for( count=0; count < len; ++count, ++j )
{
if(j == len )
j=0;
printf("%c", (*str)+j);
}

printf("\n");
}