go 比较两个版本号大小

<pre class="line-numbers language-go"><code class=" language-go"><span class="token keyword">package</span> main <span class="token keyword">import</span> <span class="token punctuation">(</span> <span class="token string">"fmt"</span> <span class="token comment">// 格式化输出的包</span> <span class="token string">"strconv"</span> <span class="token comment">//实现了基本数据类型和其字符串表示的相互转换。 </span> <span class="token string">"strings"</span> <span class="token comment">// strings包实现了用于操作字符的简单函数。</span> <span class="token punctuation">)</span> <span class="token comment">/* 比较两个版本号 version1 和 version2。 如果 version1 > version2 返回 1，如果 version1 < version2 返回 -1， 除此之外返回 0。 你可以假设版本字符串非空，并且只包含数字和 . 字符。 . 字符不代表小数点，而是用于分隔数字序列。 例如，2.5 不是“两个半”，也不是“差一半到三”，而是第二版中的第五个小版本。 你可以假设版本号的每一级的默认修订版号为 0。例如，版本号 3.4 的第一级（大版本）和第二级（小版本）修订号分别为 3 和 4。其第三级和第四级修订号均为 0。 示例 1: 输入: version1 = "0.1", version2 = "1.1" 输出: -1 示例 2: 输入: version1 = "1.0.1", version2 = "1" 输出: 1 示例 3: 输入: version1 = "7.5.2.4", version2 = "7.5.3" 输出: -1 示例 4： 输入：version1 = "1.01", version2 = "1.001" 输出：0 解释：忽略前导零，“01” 和 “001” 表示相同的数字 “1”。 示例 5： 输入：version1 = "1.0", version2 = "1.0.0" 输出：0 解释：version1 没有第三级修订号，这意味着它的第三级修订号默认为 “0”。 */</span> <span class="token keyword">func</span> <span class="token function">compareVersion</span><span class="token punctuation">(</span>version1 <span class="token builtin">string</span><span class="token punctuation">,</span> version2 <span class="token builtin">string</span><span class="token punctuation">)</span> <span class="token builtin">int</span> <span class="token punctuation">{</span> <span class="token keyword">var</span> res <span class="token builtin">int</span> <span class="token comment">// 通过字符串切割会生成一个数组</span> ver1Strs <span class="token operator">:=</span> strings<span class="token punctuation">.</span><span class="token function">Split</span><span class="token punctuation">(</span>version1<span class="token punctuation">,</span> <span class="token string">"."</span><span class="token punctuation">)</span> <span class="token comment">//[1 2 3]</span> ver2Strs <span class="token operator">:=</span> strings<span class="token punctuation">.</span><span class="token function">Split</span><span class="token punctuation">(</span>version2<span class="token punctuation">,</span> <span class="token string">"."</span><span class="token punctuation">)</span> <span class="token comment">//[2 3 4 5]</span> ver1Len <span class="token operator">:=</span> <span class="token function">len</span><span class="token punctuation">(</span>ver1Strs<span class="token punctuation">)</span> ver2Len <span class="token operator">:=</span> <span class="token function">len</span><span class="token punctuation">(</span>ver2Strs<span class="token punctuation">)</span> <span class="token comment">//fmt.Println(ver1Strs, ver2Strs)</span> verLen <span class="token operator">:=</span> ver1Len <span class="token keyword">if</span> <span class="token function">len</span><span class="token punctuation">(</span>ver1Strs<span class="token punctuation">)</span> <span class="token operator"><</span> <span class="token function">len</span><span class="token punctuation">(</span>ver2Strs<span class="token punctuation">)</span> <span class="token punctuation">{</span> verLen <span class="token operator">=</span> ver2Len <span class="token punctuation">}</span> <span class="token keyword">for</span> i <span class="token operator">:=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> verLen<span class="token punctuation">;</span> i<span class="token operator">++</span> <span class="token punctuation">{</span> <span class="token keyword">var</span> ver1Int<span class="token punctuation">,</span> ver2Int <span class="token builtin">int</span> <span class="token keyword">if</span> i <span class="token operator"><</span> ver1Len <span class="token punctuation">{</span> <span class="token comment">// 字符串转换成整数strconv.Atoi</span> ver1Int<span class="token punctuation">,</span> <span class="token boolean">_</span> <span class="token operator">=</span> strconv<span class="token punctuation">.</span><span class="token function">Atoi</span><span class="token punctuation">(</span>ver1Strs<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token keyword">if</span> i <span class="token operator"><</span> ver2Len <span class="token punctuation">{</span> ver2Int<span class="token punctuation">,</span> <span class="token boolean">_</span> <span class="token operator">=</span> strconv<span class="token punctuation">.</span><span class="token function">Atoi</span><span class="token punctuation">(</span>ver2Strs<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token keyword">if</span> ver1Int <span class="token operator"><</span> ver2Int <span class="token punctuation">{</span> res <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">1</span> <span class="token keyword">break</span> <span class="token punctuation">}</span> <span class="token keyword">if</span> ver1Int <span class="token operator">></span> ver2Int <span class="token punctuation">{</span> res <span class="token operator">=</span> <span class="token number">1</span> <span class="token keyword">break</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> <span class="token keyword">return</span> res <span class="token punctuation">}</span> <span class="token keyword">func</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> version1 <span class="token operator">:=</span> <span class="token string">"0.1"</span> version2 <span class="token operator">:=</span> <span class="token string">"1.1"</span> fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span><span class="token function">compareVersion</span><span class="token punctuation">(</span>version1<span class="token punctuation">,</span> version2<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> </code></pre><div><code class=" language-go"><span class="token punctuation"><br></span></code></div>