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src/ladderz/pre_algebra/unit1.rs.html
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</pre></div><pre class="rust"><code><span class="kw">use </span>std::collections::HashSet;
<span class="doccomment">/// Finds all factor pairs for a positive integer `n`.
@ -381,8 +416,8 @@
<span class="doccomment">/// Checks if a positive integer `n` is a prime number.
///
/// A prime number is a positive integer greater than 1 that cannot
/// be evenly divisible by any positive integers other than 1 and itself.
/// A prime number is a positive integer greater than 1 that is
/// not evenly divisible by any positive integer other than 1 and itself.
///
/// # Examples
///
@ -411,6 +446,30 @@
<span class="bool-val">true
</span>}
<span class="doccomment">/// Checks if a positive integer `n` is a composite number.
///
/// A composite number is a positive integer that is evenly divisible
/// by a positive integer other than 1 and itself.
///
/// # Examples
///
/// ```rust
/// use ladderz::pre_algebra::is_composite;
///
/// assert!(!is_composite(1)); // 1 is not a composite number
/// assert!(!is_composite(2)); // 2 is not a composite number
/// assert!(is_composite(4)); // 4 is a composite number
/// assert!(!is_composite(7)); // 7 is not a composite number
/// ```
</span><span class="kw">pub fn </span>is_composite(n: u32) -&gt; bool {
<span class="kw">for </span>num <span class="kw">in </span><span class="number">1</span>..n {
<span class="kw">if </span>n % num == <span class="number">0 </span>&amp;&amp; num != <span class="number">1 </span>&amp;&amp; num != n {
<span class="kw">return </span><span class="bool-val">true</span>;
}
}
<span class="bool-val">false
</span>}
<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use super</span>::<span class="kw-2">*</span>;
@ -483,5 +542,16 @@
<span class="macro">assert!</span>(is_prime(<span class="number">23</span>));
<span class="macro">assert!</span>(!is_prime(<span class="number">9514</span>));
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_is_composite() {
<span class="macro">assert!</span>(!is_composite(<span class="number">1</span>));
<span class="macro">assert!</span>(!is_composite(<span class="number">2</span>));
<span class="macro">assert!</span>(!is_composite(<span class="number">3</span>));
<span class="macro">assert!</span>(is_composite(<span class="number">4</span>));
<span class="macro">assert!</span>(is_composite(<span class="number">8</span>));
<span class="macro">assert!</span>(is_composite(<span class="number">27</span>));
<span class="macro">assert!</span>(is_composite(<span class="number">51</span>));
}
}
</code></pre></div></section></main></body></html>