如何用C ++

Question

这是我编写的用于在C ++中以csv格式读取excel文件的代码。我想逐行阅读文件。当我运行代码时，它给我一个错误说

  

缺少类模板'array'的参数列表

感谢。

#include <string>
#include <iostream>
#include <iomanip>
#include <fstream>
#include <array>

using namespace std;
int main() {
array<string , 29>arr;
string line;
int location;
int start = 0;

//int arrayFile[51][28] = { { 0 } };
string fileName;
ifstream infile(fileName);
infile >> line;

//error check
if (infile.fail()) {
    cout << "File not Found !" << endl;
    exit(1);
}

//reading the file

for (int i = 0; i < 29; i++) {
    location = line.find(","); //find the first comma in line
    array[i] = line.substr(start, location - start); // separate the information from line up to the comma
    line = line.substr(location + 1); //change line to the rest after removing the the abouve piece of the information

}
array[i] = line;

Answer 1

由于您声明了using namespace std并且包含<array>，array不是变量，而是模板类（C ++ 11 STL）。您必须使用它来定义实际数组，如

array<string, 29> arr;
// std::array<std::string, 29> arr;

然后您可以使用arr