--- title: Almost Always Unsigned # | daily.dev description: A detailed argument for preferring unsigned integers over signed in most programming contexts. The author systematically refutes common arguments against... canonical: https://daily.dev/posts/almost-always-unsigned--fva0lynn8 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Almost Always Unsigned # | daily.dev og:description: A detailed argument for preferring unsigned integers over signed in most programming contexts. The author systematically refutes common arguments against... og:url: https://daily.dev/posts/almost-always-unsigned--fva0lynn8 og:image: https://api.daily.dev/og/posts/Fva0LyNn8.png og:image:alt: Almost Always Unsigned # og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Almost Always Unsigned # **[Hacker News](https://daily.dev/sources/hn)** · 19 min read · 1 upvotes · 0 comments ## Summary A detailed argument for preferring unsigned integers over signed in most programming contexts. The author systematically refutes common arguments against unsigned integers (safety concerns, reverse loops, difference calculations, overflow risks, sentinel values) and demonstrates that signed integers often introduce worse problems including undefined behavior in C/C++. Practical idioms are provided for reverse iteration, safe absolute difference, midpoint calculation, and overflow detection. The author concludes that since only ~3% of integers in real programs ever represent negative values, unsigned should be the default choice, with concrete examples in C, C++, Go, Rust, and Odin. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I safely iterate a loop in reverse over an unsigned index without it going infinite due to i >= 0 always being true? Start the loop counter at size - 1 and use the condition i < size instead of i >= 0, decrementing with i--. When the counter underflows past zero it wraps to the unsigned type's maximum value, which is larger than size, so the loop condition becomes false and stops correctly, even when size is 0. _Developers hardening loop logic against off-by-one and underflow bugs compare idioms like this on daily.dev._ ### Why does malloc(sizeof(Object) * n) risk a buffer overflow even when n is a signed int? The multiplication sizeof(Object) * n can silently overflow and return a pointer to memory too small for all n objects, and using a signed int for n does not fix this since a negative value cast to size_t becomes an enormous unsigned number causing resource exhaustion instead. The safe check is: if (y && x > (T)-1/y) before multiplying, or use language constructs like C++'s new Object[n] or Go's make([]Object, n) that avoid the raw multiply. _Teams auditing allocation code for overflow bugs track patterns like this via daily.dev._ ### Why is INT_MIN / -1 undefined behavior in LLVM-based languages like Go, Rust, and Odin? INT_MIN divided by -1 mathematically produces a value one greater than INT_MAX, which cannot be represented in a signed integer of that width, so LLVM treats this as undefined behavior regardless of the source language's own wrap semantics. This also applies to x / 0, INT_MAX % -1, and INT_MAX - INT_MIN, meaning language guarantees about signed wrap do not protect against these specific LLVM-level cases. _Engineers debugging cross-language undefined behavior in LLVM targets keep track of edge cases like these on daily.dev._ ## Similar posts on daily.dev - [Signed By Default Camp](https://daily.dev/posts/signed-by-default-camp-mbr2qcdgs) · Lobsters · 0 upvotes · 0 comments - [C3](https://daily.dev/posts/c3-r4ml1zhe4) · Lobsters · 0 upvotes · 0 comments - [The Freedom of Having No Sign](https://daily.dev/posts/the-freedom-of-having-no-sign-snzslttdh) · Medium · 0 upvotes · 0 comments - [Everything in C is undefined behavior](https://daily.dev/posts/everything-in-c-is-undefined-behavior-lf4o5xfht) · Hacker News · 21 upvotes · 1 comments --- Tags: [#rust](https://daily.dev/tags/rust), [#c++](https://daily.dev/tags/c++) [View this post on daily.dev](https://daily.dev/posts/almost-always-unsigned--fva0lynn8) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Almost Always Unsigned #","url":"https://daily.dev/posts/almost-always-unsigned--fva0lynn8","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/almost-always-unsigned--fva0lynn8"},"datePublished":"2026-07-09T21:10:26.029Z","dateModified":"2026-09-14T07:13:47.937Z","description":"A detailed argument for preferring unsigned integers over signed in most programming contexts. 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