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Max value using NOT bitwise operator #1480

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Max value using NOT bitwise operator #1480

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5 changes: 4 additions & 1 deletion exercises/practice/grains/.approaches/introduction.md
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Expand Up @@ -47,7 +47,10 @@ uint64_t square(uint8_t index)

uint64_t total(void)
{
return ((((uint64_t)1 << 63) - 1) << 1) + 1;
// '~' is the NOT bitwise operator in C
// By flipping all bits of 0 in a uint64_t container (000...0 -> 111...1)
// Can you guess what it returns?
return ~0ULL;
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@ryanplusplus ryanplusplus May 21, 2026

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Came to say this. Doing this correctly is more involved than the current solution (and the sample solution provided is not meant to be "optimal", just good).

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@siebenschlaefer siebenschlaefer May 21, 2026

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@ryanplusplus This is a PR for the "Bit-shifting" approach in the "Dig Deeper" section that Bobahop wrote (https://exercism.org/tracks/c/exercises/grains/dig_deeper), not the example solution.

Comment on lines +50 to +53
}
```

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