# Summary

- The decimal number system has the base of 10 and has the numbers from 0 through 9
- The binary number system has the base of 2 and has the numbers 0 and 1.
- The octal number system has the base of 8 and has the numbers from 0 through 7
- The hexadecimal number system has the base of 16 and has the numbers from 0 through 15 (A - F)
- The decimal, binary, octal and hexadecimal has positional values to represent the data.
- Characters are represented in memory by alphanumeric codes.
- ASCII, Unicode and ISCII are the various codes used for representing values in the memory.