Posted on 2011-04-28 14:51
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void func( void )
{
int x;
switch ( x )
{
case 0 :
int i = 1; // error, skipped by case 1
{ int j = 1; } // ok, initialized in enclosing block
case 1 :
int k = 1; // ok, initialization not skipped
}
}
在VC中使用switch语句时遇到“error C2360: initialization of 'k' is skipped by 'case' label”的编译错误。
msdn有下面的说明:
compiler error c2360
initialization of identifier is skipped by case label
the specified identifier initialization can be skipped in a switch statement.
it is illegal to jump past a declaration with an initializer unless the declaration is enclosed in a block.
the scope of the initialized variable lasts until the end of the switch statement unless it is declared in an enclosed block within the switch statement.
the following is an example of this error:
在switch语句内定义一个变量的时候,如果不在一个语句块内,它是直到遇到switch的"}"才结束的。int i = 1;错误,错就错在它是以switch的"}"结束的,此时被case 1:语句跳过。int j = 1;它是遇到下面的"}"就结束了,因此正确。int k = 1;它虽然没有在一个语句块中,但它的下一个结束"}"正好就是switch的"}",不会被跳过,因此也正确。
所以,如果有在case内定义新变量,最好将该条case内的语句加上{}构成语句块,避免出错。
总之而言:在case里面声明变量要用{}进行作用域限制。