View Compilation Error

0_0_13254237_3281.c: In function 'main':
0_0_13254237_3281.c:51:3: error: expected expression before '/' token
   //char *index[20] ;
   ^
0_0_13254237_3281.c:56:4: error: expected expression before '/' token
    //index[i] = Sum(a,b) ;
    ^