foo.cc:9:4: error: stray '\' in program
    9 | d=a\100;
      |    ^
foo.cc: In function 'int main()':
foo.cc:9:4: error: expected ';' before numeric constant
    9 | d=a\100;
      |    ^~~~
      |    ;

[Hydro](https://hydro.ac)提供评测服务