Integers on rustbiteshttps://www.rustbites.com/tags/integers/Recent content in Integers on rustbitesHugoenFri, 17 Apr 2026 12:51:37 +020085. cast_signed & cast_unsigned — Explicit Sign Casting for Integershttps://www.rustbites.com/posts/bite-085/Thu, 16 Apr 2026 17:00:00 +0100https://www.rustbites.com/posts/bite-085/<p>Stop using <code>as</code> to flip between signed and unsigned integers — <code>cast_signed()</code> and <code>cast_unsigned()</code> say exactly what you mean.</p>82. isqrt — Integer Square Root Without Floating Pointhttps://www.rustbites.com/posts/bite-082/Wed, 15 Apr 2026 09:00:00 +0100https://www.rustbites.com/posts/bite-082/<p><code>(n as f64).sqrt() as u64</code> is the classic hack — and it silently gives the wrong answer for large values. Rust 1.84 stabilized <code>isqrt</code> on every integer type: exact, float-free, no precision traps.</p>81. checked_sub_signed — Subtract a Signed Delta From an Unsigned Without Castshttps://www.rustbites.com/posts/bite-081/Tue, 14 Apr 2026 17:00:00 +0100https://www.rustbites.com/posts/bite-081/<p><code>checked_add_signed</code> has been around for years. Its missing sibling finally landed: as of Rust 1.91, <code>u64::checked_sub_signed</code> (and the whole <code>{checked, overflowing, saturating, wrapping}_sub_signed</code> family) lets you subtract an <code>i64</code> from a <code>u64</code> without casting, unsafe, or hand-rolled overflow checks.</p>78. div_ceil — Divide and Round Up Without the Overflow Bughttps://www.rustbites.com/posts/bite-078/Mon, 13 Apr 2026 09:00:00 +0100https://www.rustbites.com/posts/bite-078/<p>Need to split items into fixed-size pages or chunks? The classic <code>(n + size - 1) / size</code> trick silently overflows. <code>div_ceil</code> does it correctly.</p>