Lua中数字的最大值是多少? [英] What is the maximum value of a number in Lua?

问题描述

文档中似乎没有明确的答案.

There doesn't seem to be a clear answer to this in the documentation.

我对递增自程序启动以来的秒数的变量time感兴趣.如果最大值可以算作未来的很远的数字(例如100年)，那么我就不在乎让变量永远递增.否则，我将不得不考虑将time重置为0的好方法.

I'm interested in incrementing a variable time that counts the seconds since the program started. If the maximum value can count far into the future, like 100 years, then I don't care about letting the variable increment forever. Otherwise I'm going to have to think of a good point to reset time back to 0.

推荐答案

在默认情况下，在大多数编译器中，Number是一个double，它是IEEE 64位浮点.这意味着10bit的指数，因此最大数目大约为2 ^ 1024，即5.6e300年.很久了.

as compiled by default, the Number is a double, on most compilers that's an IEEE 64-bit floating point. that means 10bit exponent, so the maximum number is roughly 2^1024, or 5.6e300 years. that's a long time.

现在，如果要增加它，您可能会对整数范围更感兴趣. 52位尾数表示可以以整数精度使用的最高数字为2 ^ 52，大约为4.5e15.每年31'557,600秒，即1.427e8，接近1.5亿年.任何过程的正常运行时间仍然很长

now, if you're incrementing it, you might be more interested in the integer range. the 52-bit mantissa means that the highest number that can be used with integer precision is 2^52, around 4.5e15. At 31'557,600 seconds/year, that's 1.427e8, almost 150 million years. still a very long uptime for any process

更新2014-12-30 :Lua 5.3(现在随时发布)增加了对通过编译标志选择的32位或64位整数值的支持.

update 2014-12-30: Lua 5.3 (to be released any moment now) adds support for integer values, either 32 or 64 bits chosen via compile flags.

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