One common method of converting symbols into binary digits for computer processing is called ascii (american standard code of information interchange). the uppercase letters a through z are assigned the numbers 65 through 90, so a has binary code 1000001 and z has code 1011010. lowercase letters a through z have codes 97 through 122 (that is, 1100001 through 1111010). ascii codes, as well as other numerical computer output, normally appear without commas. write the binary code for the letter k.