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You wrote
> Computing the NOT of a single value is also easy:
```
printf("%1$255d%1$s%hhn", a, b)
```
will compute
```
*b = (strlen(a)+255)%256 = strlen(a)-1
```
and again, because strlen(x) is either 1 or 0 we have
 ```
*c = !b
```

Well,in `*c=!b` ,where does c come from? Do you mean `*b=!a` ?
