View Compilation Error

0_0_26862783_17174.c: In function 'main':
0_0_26862783_17174.c:21:5: error: expected expression before '/' token
     //printf("%d\n",i);
     ^
0_0_26862783_17174.c:30:5: error: expected expression before '/' token
     //j--;
     ^
0_0_26862783_17174.c:31:5: error: expected expression before '/' token
     //j=(j-1+num)%num;
     ^
0_0_26862783_17174.c:37:5: error: expected expression before '/' token
     //i++;
     ^
0_0_26862783_17174.c:38:5: error: expected expression before '/' token
     //i=(i+1+num)%num;
     ^
0_0_26862783_17174.c:39:5: error: expected expression before '/' token
     //printf("%d\n",i);
     ^
0_0_26862783_17174.c:46:4: error: expected expression before '/' token
    //printf("%d\n",i);
    ^