c++ 輸入輸出和文件的操作

#include <iostream>
using namespace std;

//數據 輸入 輸出 octal hex dec 

//int main()
//{
//	char buffer[] = "2020 - hello";
//	char ch[10];
//	int n;
//
//	cout.write(buffer, 10);
//	cout.put('A');
//	//cout << "cout\r\n" << endl;
//	//cin.get( ch , 80, '.');	
//	//cout << "cout" << ch << endl;
//
//	cout << "enter a octal number:";
//		cin >> dec >> n ;
//		cout << "octal:" << oct << n;
//		cout << "hex:" << hex << n;
//		cout << "dec:" << dec << n;
//
//	getchar();
//	getchar();
//	return 0;
//}

#include <fstream>

int main()
{
	/*判斷文件結束
	1.>>讀：可以通過判斷輸入流對象值是否爲 0 
	2.get讀：判斷讀入的字符是否是EOF
	3.其他方式讀：通過成員函數eof, eof函數不需要參數，返回一個整形值。當讀操作遇到文件結束時，
	該函數返回 1 ，否則返回 0 。
	*/



	/*
	//1.打開輸入文件
	//第一種方式：
	//ifstream infile;
	//infile.open("file1");
	//infile.open("file1",ifstream::in);

	//第二種方式：利用構造函數直接打開
	ifstream infile("file1");
	ifstream infile("file1", ofstream::out);

	//2.打開輸出文件
	//第一種方式：
	//ofstream outfile;
	//outfile.open("file2");
	//outfile.open("file2",ofstream::out);

	//第二種方式：
	ofstream outfile("file2");
	ofstream outfile("file2", ofstream::out);

	//3.打開輸入輸出文件
	fstream iofile("file3");
	fstream iofile("file3", fstream::in | fstream::out);

	*/

	cout << "fstream \n"<<endl;

	ofstream out("file_out.txt");
	ifstream in;
	int i;
	if (!out)
	{  
		cerr << "create file error\n"; getchar();  return 1;
	}

	for (int i = 0; i < 10; i++)
	{
		out << i << ' ';
	}
	out.close();
	in.open("file_out.txt");
	if (!in)
	{
		cerr << "open file error \n"; getchar(); return 1;
	}
	while (in >> i)
		cout << i << ' ';
	in.close();


	getchar();
	return 0;
}

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

int main()
{
	char data_arry[1024] = { 0 };
	char d;
	int byte_count = 0;
	int _BYTE = 0;
	char _BYTE_index = 0;
	char file_name_in;
	char file_name_out;

	ifstream read("gw1n4b.fs");
	ofstream write("gw1n4b_hex.txt");


	if (!read)
	{
		cerr << "error cannot open gw1n4b.fs \r\n" << endl; getchar(); return 0;
	}
	if (!write)
	{
		cerr << "error cannot open hex.txt\n" << endl; getchar(); return 0;
	}

	//read.getline(data_arry,1024);

	//for (int i = 0; i < 1024; i++)
	//{
	//	cout << data_arry[i] << " ";
	//	if (data_arry[i] == '\0')
	//		cout << "read end";
	//}
	

	write << "bitstream[]= \n {";
	for (int i = 0; i < 20; i++)
	{
		write << "0x" << hex << 255 << ",";
	}

	write << "\n";

	while (read>>d)
	{
		if ((_BYTE_index % 8 == 0) && (_BYTE_index > 0))
		{
			write << "0x" << setw(2) << setfill('0') << _BYTE << ",";
			//cout <<hex <<_BYTE << " ";
			//printf("[%x] ", _BYTE);

			byte_count++;
			_BYTE = 0;
			_BYTE_index = 0;

			if (byte_count % 16 == 0)
				write << "\n";
		}

		if ( d == '1' || d == '0')
		{
			_BYTE <<= 1;
			_BYTE_index++;

		}

		if (d == '1')
		{
			_BYTE += 1;
		}

	}
	write << "};" ;

	read.close();
	write.close();

	cout << "byte_count:" << byte_count<<endl;

	//getchar();
	return 0;
}