2 replies to this topic

[QJK]

Hello,

I have this code

class inner {

public: 

double data; 

string label; 

}; 


class middle {

public: 

inner set[5]; 

int cnt; 

}; 


class outer {

public: 

middle part1; 

inner part2; 


};


inner x;

middle y;

outer z;

And I need to know which of the following Statement is Valid and which one is Invalid

(a) x.label = “inside”;

(b) z.part1 = y;

(c) z.part2.inner = x;

(d) x.data = y.cnt;

(e) cout << x;

(f) z.part1.set[2] = x;

(g) outer.part1 = middle;

(h) outer.part1.set[0].data = 1.0;

(i) y.set.label = “from middle”;

(j) cin >> z.part1.cnt;

---------- Post added at 04:11 PM ---------- Previous post was at 04:10 PM ----------

I answered them, but I am not sure about it :p

(a) x.label = “inside”;  [B][COLOR=Red]Valid[/COLOR][/B]

(b) z.part1 = y;         [B][COLOR=Red]Valid[/COLOR][/B]

(c) z.part2.inner = x;  [B][COLOR=Red]Valid[/COLOR][/B]

(d) x.data = y.cnt;     [B][COLOR=Red]Valid[/COLOR][/B]

(e) cout << x;      [B][COLOR=Red]Invalid[/COLOR][/B]

(f) z.part1.set[2] = x;       [B][COLOR=Red]Invalid[/COLOR][/B]

(g) outer.part1 = middle;      [B][COLOR=Red]Invalid[/COLOR][/B]

(h) outer.part1.set[0].data = 1.0;    [B][COLOR=Red]Valid[/COLOR][/B]

(i) y.set.label = “from middle”;      [B][COLOR=Red]Valid[/COLOR][/B]

(j) cin >> z.part1.cnt;        [B][COLOR=Red]Valid[/COLOR][/B]

:P What do think

[psepheroth]

For me, © is invalid; (f) is valid; (g) is valid; (i) is invalid--no bracket for set I guess.
These are just my opinion. Waiting for others to reply.

[Flying Dutchman]

Invalid ones are:

• b) z.part1 refers to a object (of type middle) and no assignment operator was provided
  
• c) z.part2 has no member named inner
  
• e) no << operator was provided to output x
  
• f) z.part1.set is an array of inner objects; no assignment operator was provided
  
• g) outer is a name of class, no an object
  
• h) see g)
  
• i) y.set is an array, it would've been valid if an array index would've been provided: y.set[0].label = "from middle";