Many groups, companies and organizations have a style guide, in addition to the language
specifications.  These then require extra tools to check that the code confirms to this
style.  Or a manual verification.

When someone switches from one group to another he has to learn using a
different style.  Or there is no specific style and code written by one person looks
quite different from what someone else writes.

It is very important that code is easy to read back.  For example, consider these two
C statements that do the same:

         for(int i=0;i<max_i;++i){
            if(CNT>i)Callme();
         }

         for (int i = 0; i < iMax; ++i) {
            if (count > i)
               callMe();
         }