上图源自：https://blog.csdn.net/LG1259156776/article/details/47035583

1 打开文件

#include<bits/stdc++.h>
using namespace std;

int main()
{
	char path[] = "./test.txt";
	//ofstream file(path); // 法1 
	ofstream file;
	file.open(path); // 法2 
	if(!file)
	{
		cout << "can not open the " << path + 2 << "!" <<endl;
		exit(0);
	}
	else
		cout << path + 2 << " has been opened!" << endl << endl;
	file.close();
	
	system("pause");
	return 0;
}

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关闭文件

	file.close();