Main.cc:4:4: error: expected initializer before 'int'
int a;
^
Main.cc:5:4: error: 'cin' does not name a type
cin>>a;
^
Main.cc:6:4: error: expected unqualified-id before 'if'
if(a>30){
^
Main.cc:9:4: error: expected unqualified-id before 'else'
else{
^
Main.cc:12:5: error: expected unqualified-id before 'return'
return 0;
^