c - 如何更改数字以被8整除

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您能告诉我如何生成大于输入数的最小数，该输入数可以被8整除吗？ （C语言中最好）

对于2的幂是否有一个通用的解决方案？

谢谢

最佳答案

大于或等于输入的最小数字，可被8整除：

return (input + 7) & ~7;

大于输入且可被8整除的最小数字：

return (input + 8) & ~7;