Course Content

# Numeral Systems 101

2. Octal Numeral system

3. Hexadecimal Numeral system

Numeral Systems 101

## Converting Using Format Method

I appreciate your desire to study 👏 if you are here, it means you are motivated a lot.

The last push of studying numeral systems is learning the format method for strings to convert numbers to different numeral systems.

`format()`

allows you to do the complex substitution, but it goes beyond this course; hence, here you are going to get acquainted with converting numbers using this method. By the way, it is an opportunity for you to pick up the one that you prefer.

This example shows you how decimal numbers can be converted to other numeral systems.

`{:b}`

is used to define the binary numeral system;`{:o}`

or`{:O}`

(both ways are acceptable) is used to define the octal numeral system;`{:X}`

(the hexadecimal number must be defined using uppercase letters) or`{:x}`

(the hexadecimal number must be defined using lowercase letters) is used to define the hexadecimal numeral system.

Subsequently, you should use the following syntax:`{:numeral_system_format}.format argument)`

.
This method has a significant benefit it prints your number without `0b`

, `0o`

, `0x`

, only converted number.
But unfortunately to convert not decimal numbers you should write `0b`

, `0o`

or `0X`

. The decimal converting is diverse you can use 3 methods 😃: `{}`

,`{:n}`

or `{:d}`

# Task

It's time for honing your skills!

- Convert number
`12`

from the hexadecimal numeral system to the decimal. - Convert number
`23`

from the octal numeral system to the hexadecimal. - Convert number
`100`

from the binary numeral system to the octal. - Convert number
`900`

from the decimal numeral system to the binary.

Everything was clear?