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