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### 14.5 `\settoheight`

Synopsis:

```\settoheight{\len}{text}
```

Sets the length \len to the height of box that LaTeX gets on typesetting the `text` argument. The length name `\len` has to be a control sequence (see Control sequence, control word and control symbol), and as such must begin with a backslash, `\` under normal circumstances.

This will print how high the characters go.

```\newlength{\alphabetheight}
\settoheight{\alphabetheight}{abcdefghijklmnopqrstuvwxyz}
\the\alphabetheight
```

If no such length \len has been declared with `\newlength`, if for example you mistype as `\settoheight{\aplhabetheight}{abc...}`, then you get something like ‘Undefined control sequence. <argument> \alphabetheight’. If you leave the backslash out of \len, as in `\settoheight{alphabetheight}{...}` then you get something like ‘Missing number, treated as zero. <to be read again> \setbox’.