20 lines
720 B
C++
20 lines
720 B
C++
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#include <iostream>
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#include <vector>
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using namespace std;
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int main()
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{
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vector<int> v; //v是存放int类型变量的可变长数组，开始时没有元素
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for (int n = 0; n<5; ++n)
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v.push_back(n); //push_back成员函数在vector容器尾部添加一个元素
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vector<int>::iterator i; //定义正向迭代器
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for (i = v.begin(); i != v.end(); ++i) { //用迭代器遍历容器
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cout << *i << " "; //*i 就是迭代器i指向的元素
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*i *= 2; //每个元素变为原来的2倍
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}
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cout << endl;
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//用反向迭代器遍历容器
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for (vector<int>::reverse_iterator j = v.rbegin(); j != v.rend(); ++j)
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cout << *j << " ";
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cout << endl;
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return 0;
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}
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