View Compilation Error

0_0_35012506_12145.c: In function 'main':
0_0_35012506_12145.c:4:16: error: array size missing in 'd'
     char a,b,c,d[],i=0,x=0,y;
                ^
0_0_35012506_12145.c:7:10: error: subscripted value is neither array nor pointer nor vector
         a[i]=a;a[++i]=b;a[++i]=c;
          ^
0_0_35012506_12145.c:7:17: error: subscripted value is neither array nor pointer nor vector
         a[i]=a;a[++i]=b;a[++i]=c;
                 ^
0_0_35012506_12145.c:7:26: error: subscripted value is neither array nor pointer nor vector
         a[i]=a;a[++i]=b;a[++i]=c;
                          ^
0_0_35012506_12145.c:13:10: error: subscripted value is neither array nor pointer nor vector
       a=a[i];b=a[i+1];c=a[i+2];
          ^
0_0_35012506_12145.c:13:17: error: subscripted value is neither array nor pointer nor vector
       a=a[i];b=a[i+1];c=a[i+2];
                 ^
0_0_35012506_12145.c:13:26: error: subscripted value is neither array nor pointer nor vector
       a=a[i];b=a[i+1];c=a[i+2];
                          ^