/in/foo.cc: In function 'int main()':
/in/foo.cc:5:10: warning: 'jy' may be used uninitialized in this function [-Wmaybe-uninitialized]
 int i,jw,jy,m;
          ^~
/in/foo.cc:5:7: warning: 'jw' may be used uninitialized in this function [-Wmaybe-uninitialized]
 int i,jw,jy,m;
       ^~