$2\mathrm{.}1.$ Variable types in Julia

A number variable in Julia can have many types. In our minds, the number $10$ or $10\mathrm{.}0$ is just that, the number $10.$ On a computer, a number is stored with some additional information. For example, numbers can be signed or unsigned integers, or floating point values. They can be represented with $8,16,32,64$ or $128$ bits.

The command

typeof $($a$)$

can be used to ascertain the type of a variable a that has been previously defined, as below.

$1$ typeof$($a$)$

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The type of $b$ can be similarly determined as below.

$1$ typeof$($b$)$

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