demo_4_file_txt_1.cpp

对于一个初涉VC＋＋的人来书

//****************************************************
// 一个含10个元素的整型数组,由键盘输入10个整数给数组,
// 并将数组存放在磁盘文件中,而后读该文件中数据到内存,
// 显示这些数据,并找到最大值者.
//****************************************************

# include <fstream.h>
# include <stdlib.h>

int main()
{
	int a[10];

//	ofstream outfile("File.txt");
//	ofstream outfile("File.txt",ios::out);
//	ofstream outfile("G:\\File.txt"); //注意文件目录中的转义字符

	ofstream outfile;
	outfile.open("File.txt");
//	outfile.open("File.txt",ios::out);
//	outfile.open("G:\\File.txt");

	if(!outfile)
	{
		cerr<<"open error!"<<endl;
		exit(1);
	}

	cout<<"enter 10 integer numbers:"<<endl;
	for(int i=0;i<10;i++)
	{
		cin>>a[i];
		outfile<<a[i]<<" ";
	}

	outfile.close();

	int max;
	
//	ifstream infile("File.txt",ios::in); 
	ifstream infile;
	infile.open("File.txt",ios::in); 
	
	if(!infile)
	{
		cerr<<"open error!"<<endl;
		exit(1);
	}
	
	for(i=0;i<10;i++)
	{
		infile>>a[i];
		cout<<a[i]<<" ";
	}

	infile.close();

	cout<<endl;

	max=a[0];
	for(i=1;i<10;i++)
	{
		if(a[i]>max)
		{
			max=a[i];
		}
	}
	
	cout<<"max="<<max<<endl;

	return 0;
}

/*
enter 10 integer numbers:
1 2 3 4 5 6 7 8 9 0
1 2 3 4 5 6 7 8 9 0
max=9
Press any key to continue
*/