stringはそもそもchar配列

stringはそもそもchar配列という基本を確認。

	string line2;
	cout << "何か数字を入力してください> " << flush;
	getline(cin, line2);
	cout << line2 << endl;
	const char* line_array = line2.c_str();
	const int size = line2.size();
	cout << "文字列配列の長さ: " << size << endl;
	for(int i = 0; i < size; ++i){
	unsigned char c = (unsigned char)line_array[i];
	cout << c << endl;
	}

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