View Compilation Error

0_0_35012404_32694.c: In function 'main':
0_0_35012404_32694.c:4:16: error: array size missing in 'd'
     char a,b,c,d[],i=0,x=0,y;
                ^
0_0_35012404_32694.c:7:10: error: subscripted value is neither array nor pointer nor vector
         a[i]=a;a[++i]=b;a[++i]=c;
          ^
0_0_35012404_32694.c:7:17: error: subscripted value is neither array nor pointer nor vector
         a[i]=a;a[++i]=b;a[++i]=c;
                 ^
0_0_35012404_32694.c:7:26: error: subscripted value is neither array nor pointer nor vector
         a[i]=a;a[++i]=b;a[++i]=c;
                          ^
0_0_35012404_32694.c:13:30: error: subscripted value is neither array nor pointer nor vector
         printf("%c %c %c\n",a[i],a[i+1]a[i+2]);
                              ^
0_0_35012404_32694.c:13:35: error: subscripted value is neither array nor pointer nor vector
         printf("%c %c %c\n",a[i],a[i+1]a[i+2]);
                                   ^
0_0_35012404_32694.c:13:40: error: expected ')' before 'a'
         printf("%c %c %c\n",a[i],a[i+1]a[i+2]);
                                        ^