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    1. 1 this ???/friend ?? ? class/operator overloading C++?? 9?? ? ? ?

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    7. 7 ???(friend)??? ?? friend ??? ?? - ?? ???? this???? ?? ?? ??. - ???? ??(private) ??? ??? ? ??. - ? ???? ????? ?? ???? ???? ? ? ??. friend ??? ??? ? - ??? ??(operator overloading) - ?? ??? ??? ?? ??? ?? - ??? ??? ? ? ??? ?? ?? ???? ??? ?? ??? ?? friend ??? ?? - ???? ???? ? ??? ?????? ??. - friend ???? ?? friend ??? ???? ???.

    8. 8 ??????(friend??? ??)-1 #include<iostream.h> class truck; // ?? ??(forward reference) class car { int passengers; int speed; public: car(int p, int s) { passengers = p; speed = s; } friend int sp_greater(car c, truck t); // friend ??? ??: sp_greater()?? car? ???? ?? ?? };

    9. 9 ??????(friend??? ??)-2 class truck { int weight; int speed; public: truck(int w, int s) { weight = w, speed = s; } friend int sp_greater(car c, truck t); // friend ??? ??: sp_greater()?? truck? ???? ?? ?? }; int sp_greater(car c, truck t) { return c.speed – t.speed; // private? ? ???? ?? }

    10. 10 ??????(friend??? ??)-3 main() { int t; car c1(6,55), c2(2,120); truck t1(10000,55), t2(20000,72); cout << “Comparing c1 and t1 :\n”; t = sp_greater(c1,t1); if(t<0) cout << “Truck is faster.\n”; else if(t==0) cout << “Car and truck speed is the same.\n”; else cout << “Car is faster.\n”;

    11. 11 ??????(friend??? ??)-4 cout << “\n Comparing c2 and t2 :\n”; t = sp_greater(c2,t2); if(t<0) cout << “Truck is faster.\n”; else if(t==0) cout << “Car and truck speed is the same.\n”; else cout << “Car is faster.\n”; return 0; }

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    13. 13 friend class(1) ??? ????? ?? ???? friend class ? ?? friend class Other

    14. 14 ??(friend) ??? ??? ?????. Myclass ? Other Myclass ? Other Myclass? ????? Other ???? private?? protected ????? ?? ?????? ??? ? ??. friend class(2)

    15. 15 ??? ??(operator overloading) ????? ?? ???? ?? ???? ???? ?? - ???? ??? ?? ???? ?? ??? ?? ??, ??? ??? ???. ??? ?? - ??? ??(Operator function)? ?? - ??? ??? ?? ????

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    19. 19 ??? ??? ??(3) ??? ??? ? ? ?? ???? ?? ??? ??? ?????? ??? ?? ????? ??? ??? ? ??. w ‘+’ ???? ????? ??? ????? ????? ??. ‘=’ ???? ???? ??? ??? ?? ???? ????. ??? ??? ??? ??? ??? ????? ??. w ??? + ? ???? + ??? ??? ??? ??? ?? ? ??. ?? ?? ??? + - *(??) / % & | ~ ! , = < > <= >= ++ -- << >> == != && || += -= *= /= %= &= |= <<= >>= [] ( ) -> new delete ???? ? ?? ??? w .(???????) ::(?????) *(??? ???) ? :(??? ??) sizeof

    20. 20 ?? ???(binary operator) ? ??(1) ?? ? ?? ?????? ??

    21. 21 ?? ???(binary operator) ? ??(2) coord coord :: operator + (coord ob2) { coord temp; temp.x = x + ob2.x; temp.y = y + ob2.y; return temp; } main() { coord o1(10,10), o2(5,3), o3; int x,y; o3 = o1 + o2; // o3 = o1 + o2 + o1; o3.get_xy(x,y); // (o1+o2).get_xy(x, y); cout << “(o1+o2) X:” << x << “,Y:” << y << “\n”; return 0; }

    22. 22 ?? ???? ??(+)(3) #include<iostream.h> class myclass { int x; public : myclass() { x = 0; } myclass(int n) { x = n; } int getx() { return x; } };

    23. 23 ?? ???? ??(+)(4)

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