book: add missing result (#291)

saukymo · Shaobo Liu · web-flow · commit 2659a5f2073d · 2024-06-01T12:08:51.000+02:00
Co-authored-by: Shaobo Liu &lt;shaobo@apple.com&gt;
diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md
@@ -963,7 +963,7 @@ enum class new_enum : unsigned int {
 
 ```cpp
 if (new_enum::value3 == new_enum::value4) {
-    // 会输出
+    // 会输出true
     std::cout << "new_enum::value3 == new_enum::value4" << std::endl;
 }
 ```

Original file line number	Diff line number	Diff line change
`@@ -963,7 +963,7 @@ enum class new_enum : unsigned int {`
`963`	`963`
`964`	`964`	```cpp
`965`	`965`	`if (new_enum::value3 == new_enum::value4) {`
`966`		`- // 会输出`
	`966`	`+ // 会输出true`
`967`	`967`	`std::cout << "new_enum::value3 == new_enum::value4" << std::endl;`
`968`	`968`	`}`
`969`	`969`	```