foo.cc: In function 'int main()':
foo.cc:14:18: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   int h=qgw(i)+i%10;
                  ^~
foo.cc: In function 'int qgw(int)':
foo.cc:45:9: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return y; 
         ^