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1.前言
本篇目的：理解C++之vector<vector>中的vector元素。
2.应用实例
1.遍历vector中的元素
#include <iostream>
#include <vector>int main() {std::vector<int> intVector = {1, 2, 3, 4, 5};// 使用 for 循环遍历元素for (const auto& num : intVector) {std::cout << num << " ";}std::cout << std::endl;// 使用索引方式遍历元素for (size_t i = 0; i < intVector.size(); ++i) {std::cout << intVector[i] << " ";}std::cout << std::endl;// 使用迭代器方式遍历元素for (auto it = intVector.begin(); it != intVector.end(); ++it) {std::cout << *it << " ";}std::cout << std::endl;return 0;
}
2.访问vector＜vector＜char＞＞中的vector＜char＞元素
#include <iostream>
#include <vector>int main() {std::vector<std::vector<char>> charVector = {{'H', 'e', 'l', 'l', 'o'},{'W', 'o', 'r'},{'0', '1', '2', '3', '4', '5'}};//打印printf("charVector.size() = %ld\n",charVector.size());printf("charVector[0].size() = %ld\n",charVector[0].size());printf("charVector[0] = %s\n",charVector[0].data());printf("\n");printf("charVector[1].size() = %ld\n",charVector[1].size());printf("charVector[1] = %s\n",charVector[1].data());printf("\n");printf("charVector[2].size() = %ld\n",charVector[2].size());printf("charVector[2] = %s\n",charVector[2].data());printf("\n");//遍历for(int i = 0; i<charVector.size(); i++){printf("data[%d] = %s, len = %ld",i, charVector[i].data(),charVector[i].size());printf("\n");}return 0;
}
