chapter2-12.cpp

STL程序员开发指南源码

//文件名：CHAPTER2-12.cpp
#include<fstream.h>
#include<iostream.h>
#include<process.h>
void  main()
{
	int  i=30;
	float  f=12.34;
	char  c;
	fstream  fl("sf",ios::out|ios::in);
	if(!fl) {cerr<<"The File Open Error."<<endl; exit(255);}
	fl<<"I="<<i<<"  ;F="<<f<<endl;
	fl.seekp(ios::beg);		//指针回文件首
	fl>>c>>c;			//字符串"I="读出后不使用
	fl>>++i;				//i加1后从盘上读出i仍为30
	cout<<i<<endl;
}