在C＃中将类型'uint'转换为'int'

Question

I am trying to assign an int to an hex number. const int a = 0xFFFFFFF0; I got an error: Cannot implicitly convert type 'uint'. An explicit conversion exsist (are you missing a cast?) Does someone know how to fix it? tnx

Answer 1

    const int a = unchecked((int)0xFFFFFFF0);

或更简单：

    const int a = -16;

Answer 2

use

const uint a = 0xFFFFFFF0

;-)

Background: 0xFFFFFFF0 is too big to fit into an int , which goes from − 2,147,483,648 to 2,147,483,647, where as uint goes from 0 to 4,294,967,295, which is just above 0xFFFFFFF0 (= 4,294,967,280).

Answer 3

Int32.MaxValue is 0x7FFFFFFF . I guess c# is trying to convert the value you're trying to assing to a uint (which can accomodate it) before assigning it

Answer 4

there is another way to convert without using the unchecked keyword:

uint ui = 0xFFFFFFFF;

int ii = System.BitConverter.ToInt32(BitConverter.GetBytes(ui),0);// this is -1

Answer 5

将0xFFFFFFF0变量存储到uint中，因为它太大而无法容纳在int中