运行 ID: 40919

Main.cc:17:2: error: expected unqualified-id before ‘else’
  else gcd(y,x%y);
  ^~~~
Main.cc:18:1: error: expected declaration before ‘}’ token
 } 
 ^
Main.cc: In function ‘int gcd(int, int)’:
Main.cc:9:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^