如何实现乘法，而无需使用乘法运算符在.NET [英] How to implement multiplication without using multiplication operator in .NET
问题描述
我想实现两个整数乘法，而无需使用乘法运算符，在.NET
I want to implement multiplication of two integer numbers without using multiplication operator, in .NET
public uint MultiplyNumbers(uint x, uint y)
{
}
任何想法！
推荐答案
我假设这是功课...否则有你想要做任何理智的理由。所以我只给提示...
I'm assuming this is homework... otherwise there's no sane reason you'd want to do it. Therefore I'll just give hints...
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如果性能不是非常重要，考虑到
X * 3 = X + X + X...考虑使用一个循环。
If performance isn't terribly important, consider that
x * 3 = x + x + x... think about using a loop.
如果性能很重要，但你知道的的一个数的将是小，环路上的较小的数字。
If performance is important but you know that one of the numbers will be small, loop on the smaller number.
如果性能是重要的，这两个数字可能会很大，你需要考虑位变换。请记住， X * 2 是
If performance is important and both numbers could be large, you'll need to think about bit-twiddling. Remember that x * 2 is x << 1, and go from there.
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