从文本文件中读内容（显示到控制台界面上）

优化前的代码：

#include <fstream>
#include <iostream>
#include <string>

int main()
{
	using namespace std;

	// ifstream is used for reading files
	// We'll read from a file called Sample.txt
	//char str[256];
	//cout << "Enter the name of an existing wokflowlog file: " << endl;
	//cin.get (str,256);
	//ifstream inf.open(str);
	ifstream inf("Sample.txt");

	// If we couldn't open the output file stream for reading
	if (!inf)
	{
		// Print an error and exit
		cerr << "Uh oh, Sample.txt could not be opened for reading!" << endl;
		exit(1);
	}

	// While there's still stuff left to read
	while (inf)
	{
		// read stuff from the file into a string and print it
		string strInput;
		inf >> strInput;
		cout << strInput << endl;
	}

	return 0;

	// When inf goes out of scope, the ifstream
	// destructor will close the file
}

输出结果如下图：

优化后的代码：

#include <fstream>
#include <iostream>
#include <string>

int main()
{
	using namespace std;

	// ifstream is used for reading files
	// We'll read from a file called Sample.txt
	ifstream inf("Sample.txt");

	// If we couldn't open the input file stream for reading
	if (!inf)
	{
		// Print an error and exit
		cerr << "Uh oh, Sample.txt could not be opened for reading!" << endl;
		exit(1);
	}

	// While there's still stuff left to read
	while (inf)
	{
		// read stuff from the file into a string and print it
		std::string strInput;
		getline(inf, strInput);
		cout << strInput << endl;
	}

	return 0;

	// When inf goes out of scope, the ifstream
	// destructor will close the file
}

输出结果如下图：