37 lines
797 B
Markdown
37 lines
797 B
Markdown
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# String::ToLower / ToUpper
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```cpp
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String ToLower() const;
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String ToUpper() const;
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```
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将字符串转换为小写/大写形式，返回一个新的 String 对象，原字符串不变。
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**参数：** 无
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**返回：** 转换后的新 String 对象
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**复杂度：** O(n)，其中 n 为字符串长度
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**示例：**
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```cpp
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#include "XCEngine/Containers/String.h"
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#include <iostream>
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int main() {
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XCEngine::Containers::String s("Hello World 123");
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XCEngine::Containers::String lower = s.ToLower();
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std::cout << lower.CStr() << std::endl; // 输出: hello world 123
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XCEngine::Containers::String upper = s.ToUpper();
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std::cout << upper.CStr() << std::endl; // 输出: HELLO WORLD 123
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return 0;
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}
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```
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## 相关文档
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- [String 总览](string.md) - 返回类总览
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