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    <description><![CDATA[1、变量定义 // 不可变变量 let guess = String::new(); // 不可变变量可以用let 关键字来遮蔽变量 let x = 5; let x = x + 1; // 可变变量 let mut guess = String::new(); 2、数据类型 // 数值类型 8 位 i8]]></description>
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