std::numeric_limits<float>::lowest()
时间: 2023-09-20 18:05:37 浏览: 37
`std::numeric_limits<float>::lowest()` 返回 `float` 类型的最小值,即最负浮点数。它通常等于 `-FLT_MAX`,即 `-3.4028235e+38`。注意,它不同于 `std::numeric_limits<float>::min()`,后者返回的是 `float` 类型的最小正值。
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std::numeric_limits<float>::infinity()
This is a constant value in the C++ standard library that represents positive infinity for the floating-point data type 'float'. It can be used to compare against other values to determine if they are larger or smaller than infinity. For example:
```
float x = std::numeric_limits<float>::infinity();
float y = 10.0f;
if (y < x) {
// y is smaller than infinity
}
if (x < y) {
// infinity is larger than y
}
```
Note that comparisons involving infinity must be done carefully, as they can lead to unexpected behavior such as NaN (not a number) results.
std::numeric_limits<float>::quiet_NaN ()
`std::numeric_limits<float>::quiet_NaN()`是C++标准库中的一个函数,用于返回一个表示“不是数字(NaN)”的浮点数值。NaN指的是一种无法表示的或者未定义的浮点数值,它通常表示出现了某种错误或者非法的运算,例如0.0/0.0或者sqrt(-1)。在C++中使用这个函数可以方便地生成一个NaN值,以便在处理浮点数的过程中进行相关的错误检测和处理。