/in/foo.c: In function 'main':
/in/foo.c:5:40: error: conflicting types for 'a'
      int i,j,n,r,xiaobei,fenzi,a,b,c,d,a[16][2];
                                        ^
/in/foo.c:5:32: note: previous declaration of 'a' was here
      int i,j,n,r,xiaobei,fenzi,a,b,c,d,a[16][2];
                                ^
/in/foo.c:24:3: error: assignment to expression with array type
  a=xiaobei,b=fenzi;
   ^
/in/foo.c:24:11: warning: left-hand operand of comma expression has no effect [-Wunused-value]
  a=xiaobei,b=fenzi;
           ^
/in/foo.c:31:5: error: invalid operands to binary / (have 'int (*)[2]' and 'int')
  c=a/xiaobei;
    ~^