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The `format`

command has many options designed specifically for controlling the appearance of numbers. Let’s look at some of the more useful ones.

First, we can use `format`

to display a number using a different base. For instance, we can display a number in hexadecimal (base-16) with the `˜x`

control sequence:

>The number 1000 in hexadecimal is 3E8`(format t "The number 1000 in hexadecimal is ˜x" 1000)`

Similarly, we can display a number in binary (base-2) using the `˜b`

control sequence:

>The number 1000 in binary is 1111101000`(format t "The number 1000 in binary is ˜b" 1000)`

We can even explicitly declare that a value will be displayed as a decimal (base-10) number, using the `˜d`

control sequence: