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| cardinals03 (17) |  |
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I have the following review question. A list contains the values 30,40,60 in that order. p&q are iterators that point to integers on the list. What will the following print?
I think it is 40. p initially starts at 30 then increments to 40. q then inserts 20 as the value. p then goes back to the beginning of the list (30) and increments to the next value (now 20). Am I right? The thing that is hanging me up is wondering whether or not the value of p is updated by p++ or if it stays 30 (then the output would be 50). Thanks | |||
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| firedraco (4744) | |
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It would be 40 (assuming the insert function puts the 20 in front of the iterator): p = intlist.begin(); 30 40 60 ^p p++; 30 40 60 ___^p q = intlist.insert(p, 20); 30 20 40 60 ___^q p is probably garbage since IIRC iterators are invalidated by inserts p = intlist.begin(); 30 20 40 60 ^p_^q p++; 30 20 40 60 ___^q/p | |
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| demosthenes2k8 (174) | |
Erm...wouldn't that print 40, because they're getting the value at p and adding the value at q, both of which are 20?
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| firedraco (4744) | |
| Er...yeah >_> | |
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Pointer Question