使用c++从execl中读取第11，12列的所有元素并输出

可以使用C++中的文件流和字符串流来读取execl中的数据。假设execl文件的分隔符为逗号，可以按照以下步骤进行操作：

1. 包含头文件

#include <fstream>
#include <sstream>
#include <iostream>
#include <string>
#include <vector>

2. 打开execl文件

std::ifstream file("example.csv");
if (!file.is_open()) {
    std::cout << "Failed to open file!" << std::endl;
    return 1;
}

3. 读取第11，12列的数据并输出

std::string line;
std::vector<std::string> col11, col12;
while (std::getline(file, line)) {
    std::stringstream ss(line);
    std::string cell;
    int col_idx = 0;
    while (std::getline(ss, cell, ',')) {
        ++col_idx;
        if (col_idx == 11) {
            col11.push_back(cell);
        } else if (col_idx == 12) {
            col12.push_back(cell);
        }
    }
}

for (int i = 0; i < col11.size(); ++i) {
    std::cout << "Col 11: " << col11[i] << ", Col 12: " << col12[i] << std::endl;
}

完整代码如下：

#include <fstream>
#include <sstream>
#include <iostream>
#include <string>
#include <vector>

int main() {
    std::ifstream file("example.csv");
    if (!file.is_open()) {
        std::cout << "Failed to open file!" << std::endl;
        return 1;
    }

    std::string line;
    std::vector<std::string> col11, col12;
    while (std::getline(file, line)) {
        std::stringstream ss(line);
        std::string cell;
        int col_idx = 0;
        while (std::getline(ss, cell, ',')) {
            ++col_idx;
            if (col_idx == 11) {
                col11.push_back(cell);
            } else if (col_idx == 12) {
                col12.push_back(cell);
            }
        }
    }

    for (int i = 0; i < col11.size(); ++i) {
        std::cout << "Col 11: " << col11[i] << ", Col 12: " << col12[i] << std::endl;
    }

    return 0;
}