问题:

解答:

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main()
{
	string filename;
	ifstream stream;
	char read_char;
	int count=0;
	cout << "请输入要打开的文件:";
	getline(cin, filename);
	stream.open(filename);
	if (!stream.is_open())
	{
		cout << "打开文件失败!";
		exit(EXIT_FAILURE);
	}

	while (!stream.eof())
	{
		stream >> read_char;
		count++;
	}
	cout << filename << "文件含有" << count << "个字符" << endl;
	stream.close();

	return 0;
}

运行结果:

考查点:

• 读文件操作

注意:

• 文件结束符
• 根据数据类型读相应的字节