如果有文件“xxx”,代码是这样写吗\

# include < iostream >
# include < cstdlib >
 using namespace std ;
 int main (){
 	int a , b ;
 	freopen (" xxx . in "," r ", stdin );
 	freopen (" xxx. out "," w ", stdout );
 	cin >> a >> b ;
 	cout << a <<'+'<< b <<'='<< a + b << endl ;
 	return 0;
 }