Return a variable like char *?

海里的浪

Function: void fun (char * in, char * out)
The out that needs to be returned is a character pointer, and its size is not known before the function call, so how to call it?

海里的浪

How to return such a variable?

wogenius

Can void have a return value?

diamond52

What do you mean

海里的浪

Return value in out

In fact, how to return a variable-length array

海里的浪

I don't know how big the returned array is before the function call, so how do I pass the parameters?

wogenius

out is a pointer, all you pass in is the address ~~~

海里的浪

I know, so how do I initialize this address?

sing2002

In addition, add a parameter to indicate the size of the array, try it:
void fun (char * in, char * out, int n)

海里的浪

In addition, add a parameter to indicate the size of the array, try it:
void fun (char * in, char * out, int n)

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I know I need to add a parameter to indicate the size of the array, but how to use it? I did n’t know the size of the out array before, so there was no way to initialize it, so how to pass parameters?