将int转换为C中的short [英] convert int to short in C

问题描述

我有：

int a = 2147483647;
short b = (short)a;

我得到 b = -1 我希望 int32 转换为 int16 （ short ） 。我希望看到一些价值和不 -1 。

and I get b = -1 whereas I expect int32 to be converted to int16(short). I expect to see some value and not -1.

请有人帮帮我。

推荐答案

你的int A大于短的大小。将A转换为short时，最左边的位数为1，这表示它是负数。因为你得到-1，我想你在所有16位中得到1，这将给你-2 ^ 15 + 2 ^ 14 + 2 ^ 13 ... + 2 ^ 0，这将给你-1。简而言之（没有双关语），如果它太大，则无法将整数转换为short。

Your int A is larger than the size of short. When you convert A to short, you get a 1 in the left most bit, which is going to indicate that it is a negative number. Since you're getting -1, I suppose you're getting 1s in all 16 bits, which is going to give you -2^15 + 2^14 + 2^13... + 2^0, which will give you -1. In short (no pun intended), you can't convert the integer to a short if it is too large.

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