Just going through my C++ book and came across an exercise about iterators and vectors and stuff.
It asked me to write a program (using iterators in a for loop) that would take ints into a vector and then reverse the vector before printing it.
i.e. if I enter 1 2 3 4 5 into the console window it would print out as 5 4 3 2 1 (with new lines instead of spaces).
The for loop I wrote went like this...
data is my vector storing the inputs.
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| Code: for(vector<int>::iterator up(data.begin()), down(data.end() - 1) ; up < down ; ++up, --down) { //swap entries } | |
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i.e. up starts at the front and goes up. down starts at the last entry (NB not the off the end entry) and goes down. if up >= down then it ends.
This worked perfectly and fit everything into the for loop control. It seemed to work a treat.
However, the book came up with this...
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| Code: for (vector<int>::iterator start(data.begin()), end(data.end()) ; start != end ; /*nothing here*/) { --end; if (start != end) { //swap entries ++start; } } | |
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It seems like their way is a lot more long winded and harder to read (for me anyway).
Which would you prefer?
