运行 ID: 16524

Main.cc:3:5: error: cannot declare ‘::main’ to be a global variable
 int main{
     ^~~~
Main.cc:4:5: error: expected primary-expression before ‘int’
     int a;
     ^~~
Main.cc:4:5: error: expected ‘}’ before ‘int’
Main.cc:5:5: error: ‘cin’ does not name a type; did you mean ‘main’?
     cin>>a;
     ^~~
     main
Main.cc:6:5: error: ‘cout’ does not name a type
     cout<