switch 语句中第一个“案例"之前的代码 [英] Code before the first 'case' in a switch-statement
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问题描述
In C it's possible to write code before the first case
label. Are there any cases for which it is useful to do this or is it just a 'dead block of code' ?
E.g.:
switch (...) {
{
int a = 0x2a;
printf("%d
", a);
}
case 0:
...
}
解决方案
It can be useful to declare variables that have a scope limited to the switch
block (but be aware that any initialisers for those variables will be skipped):
switch (...)
{
int n;
case 0:
...
}
In theory, you could also put code there that you get to using goto
.
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