Main.cc:3:5: error: cannot declare '::main' to be a global variable
    3 | int main{
      |     ^~~~
Main.cc:4:6: error: expected primary-expression before 'int'
    4 | cin>>int a>>int b;
      |      ^~~
Main.cc:4:6: error: expected '}' before 'int'
Main.cc:3:9: note: to match this '{'
    3 | int main{
      |         ^
Main.cc:5:1: error: 'cout' does not name a type
    5 | cout<<a+b;
      | ^~~~
Main.cc:6:1: error: expected declaration before '}' token
    6 | }
      | ^