Alignment that contains comment lines that has ending "{"

The version I used is 8.9.586.

I noticed that vim alignment for c program is kind of strange. For example, in the following example, when line "//if(2) {" is in front of line "if(1) {", the alignment is fine (used gg=G to align the whole file). But if I switch the order of these two lines, the last "}" doesn't align correctly. Is this a known problem of vim? Any work around?

Similar question is for the match command "%": It seems the % command take the ending "{" in a comment line into account as well. In the following example, the first "{" can't find any matching "}". Is there a way to solve this problem? Thanks.

--Karl

#include <stdio.h>

int main()

{

    //if (2) {

    if (1) {

        printf("1\n");

    }

}

=====================

#include <stdio.h>

int main()

{

    if (1) {

        //if (2) {

        printf("1\n");

    }

    } <<<< not aligned well.