MutableBigInteger(MutableBigInteger val){
  intLen=val.intLen;
  value=Arrays.copyOfRange(val.value,val.offset,val.offset + intLen);
}

MutableBigInteger ( MutableBigInteger val ) { intLen = val . intLen ; value = Arrays . copyOfRange ( val . value , val . offset , val . offset + intLen ) ; }
construct a new mutablebiginteger with a magnitude equal to the specified mutablebiginteger .
