foo.cc: In function 'int main()':
foo.cc:14:20: error: expected primary-expression before '%' token
   14 |         scanf("%d",%n);
      |                    ^
foo.cc:18:24: error: expected '(' before 'opt'
   18 |                 switch opt:
      |                        ^~~
      |                        (
foo.cc:20:17: error: case label '2' not within a switch statement
   20 |                 case 2:scanf("%d",&v),add = v;break;
      |                 ^~~~
foo.cc:21:17: error: case label '3' not within a switch statement
   21 |                 case 3:scanf("%d",&v),que = v;break;
      |                 ^~~~
foo.cc:22:17: error: case label '4' not within a switch statement
   22 |                 case 4:scanf("%d",&v),cover = v;break;
      |                 ^~~~
foo.cc:23:17: error: case label '5' not within a switch statement
   23 |                 case 5:scanf("%d",&v),printf("%d",ask(v));break;
      |                 ^~~~
foo.cc:25:2: error: expected '}' at end of input
   25 | }
      |  ^
foo.cc:13:11: note: to match this '{'
   13 | int main(){
      |           ^

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