在 Java 中，float 和 double 是两种用于表示浮点数的类型，它们的主要区别体现在存储大小、精度和使用场景上。以下是它们的详细对比： float：占用 32 位（4 字节） 内存。 double：占用 64 位（8 字节） 内存。 类比： 如果把内存比作一个容器，float 是一个较小的 ...

工程计算：机械设计、结构分析、流体力学等需要精确结果的领域。 2. 默认浮点数类型 场景：在 Java 中，浮点数常量（如 3.14）默认是 double 类型。 如果需要 float 类型，必须显式指定（如 3.14f）。 使用 double 可以避免类型转换的麻烦。 3. 现代硬件性能优化 场景 ...

cout<<"The value of 34.4f is "<<sizeof(34.4f)<<endl; cout<<"The value of 34.4F is "<<sizeof(34.4F)<<endl; cout<<"The value of 34.4l is "<<sizeof(34.4l)<<endl; cout<<"The value of 34.4L is "<<sizeof(34 ...

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