如何从 rand() 获取特定范围的数字? [英] How do I get a specific range of numbers from rand()?

问题描述

srand(time(null));

printf("%d", rand());

给出一个高范围的随机数(0-32000ish)，但我只需要大约 0-63 或 0-127，虽然我不知道如何去做.有什么帮助吗?

Gives a high-range random number (0-32000ish), but I only need about 0-63 or 0-127, though I'm not sure how to go about it. Any help?

推荐答案

rand() % (max_number + 1 - minimum_number) + minimum_number

所以，对于 0-65:

So, for 0-65:

rand() % (65 + 1 - 0) + 0

(很明显，您可以将 0 去掉，但它是为了完整性).

(obviously you can leave the 0 off, but it's there for completeness).

请注意，这会略微偏向随机性，但如果您不是在做一些特别敏感的事情，则可能无需担心.

Note that this will bias the randomness slightly, but probably not anything to be concerned about if you're not doing something particularly sensitive.

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