tr1 byte \"Please input the first 64-bit in hex:first - second\",0dh,0ah,0 string byte \"remener :use enter to tell high 32-bit from low 32-bit\",0dh,0ah,0 examp1 byte \"eg: 1234ecdf\",0dh,0ah,0 examp2 byte \" 03ab2543\",0dh,0ah,0-tr1 byte