/in/foo.cc: In function 'int main()':
/in/foo.cc:9:8: error: expected '(' before 'if'
  while if(a == "妈妈"){
        ^~
/in/foo.cc:9:8: error: expected primary-expression before 'if'
/in/foo.cc:9:8: error: expected ')' before 'if'
/in/foo.cc:12:18: error: expected ';' before '{' token
   (a != "妈妈"){
                  ^
/in/foo.cc: At global scope:
/in/foo.cc:18:2: error: expected unqualified-id before 'return'
  return 0;
  ^~~~~~
/in/foo.cc:19:1: error: expected declaration before '}' token
 }
 ^