c++问题，。。。。。。。。。

void swap(int *p1,int *p2);
swap(&i,&j);
Box() {}
Box(int h,int w,int l) {height = h;width = w;length = l;}
friend ostream& operator << (ostream & output,Complex & c); 
return output;
friend istream& operator >> (istream & input,Complex & c); 
return input;
class Derived : public Base
Derived(int a,int b) : Base(a),d_number(b) {}
Complex operator + (Complex &c2);
c3 = c1+c2;
class student : public person
p = (int*)malloc(n*sizeof(int));
free p;
cout << i << "*" << j << "=" << i*j<< " ";