运行 ID: 5176

Main.cc: In function ‘int main()’:
Main.cc:4:2: error: ‘doubleq’ was not declared in this scope
  doubleq a,p;
  ^~~~~~~
Main.cc:4:2: note: suggested alternative: ‘double’
  doubleq a,p;
  ^~~~~~~
  double
Main.cc:5:7: error: ‘a’ was not declared in this scope
  cin>>a;
       ^
Main.cc:7:3: error: ‘p’ was not declared in this scope
   p=2*a*0.9;
   ^
Main.cc:11:3: error: ‘p’ was not declared in this scope
   p=a*2;
   ^