> int main()
> {
> 	int a,b;
> 	cin>>a>>b;
> 	
> 	cout<<a+b<<"\n";
> 	return 0;
> }编译没错误，但是
> void main()
> {
> 	int a,b;
> 	cin>>a>>b;
> 	
> 	cout<<a+b<<"\n";
> }就会出现编译错误