在ac＃开关中，我可以使用大小写作为默认值吗？

Question

Can I refer to a case in default instead of copy-pasting the whole code?

For example:

switch(n)
{
    case(1): //code here...
        break;
    case(2): //code here...
        break;
    case(3): //code here...
        break;
    default: case(2);
        break;
}

Answer 1

Just put it second to last, followed by default :

switch(n)
{
    case(1): //code here...
        break;
    case(3): //code here...
        break;
    case(2):
    default: //code here...
        break;
}

Or simply, not include it at all. If that case isn't hit, then it will fall back to the default anyway.

Answer 2

You can do like this. If there is no case, it will got to the default .

switch(n)
{
    case(1): //code here...
        break;
    case(3): //code here...
        break;
    default:
        break;
}

No need to do

case(2):
default: //code here...
     break;

Answer 3

If you want to refer default to case 2, you can omit case 2. Then every case 2 should jump to case default.

switch(n)
{
    case(1): //code here...
        break;

    case(3): //code here...
        break;

    default:  //case 2 should jump to this section because its not listed in your switch-cases
        break;
}

Answer 4

If you don't have any code in the default case, you can simply omit case 2 and move that code to the default, like the other answers say.

If you do have code that has to be run in the default case before you want to move on to case 2, you can use a goto . Here's an example using int :

int n = 5;
switch(n)
{
    case 1: //code here...
        break;
    case 2: //code here...
        break;
    case 3: //code here...
        break;
    default:
        //some code
        goto case 2;
}

Answer 5

Something like this:

switch(n)
{
    case(1): //code here...
        break;
    case(3): //code here...
        break;
    case(2):
    default: 
        break;
}