开发笔记：实验7的文件读写操作

#include<iostream>
#include
using namespace std;
int main()
{
ofstream out("test11.txt");
if(!out)
{
cout<<"fail"< return 1;
}
string a="已成功写入文件";
out< out.close();
return 0;
}

#include
#include
#include
using namespace std;
int main()
{
ifstream in("H:\\test11.txt");
if(!in)
{
cout<<"fail"< return 1;
}
string s;
getline(in,s);
cout< return 0;
}

#include
#include
#include
using namespace std;
int main()
{
fstream in("H:\\test11.txt");
if(!in)
{
cout<<"fail"< return 1;
}
in.clear();
in.seekg(0,ios::end);
string s;
s="已成功添加字符";
in< in< in.close();
return 0;
}

#include
#include
#include
#include
#include
using namespace std;
class C{
public:
int x;
string xuehao;
string name;
string Class;
};
int main()
{
int i=0;
class C A[83];
ifstream in("H:\\list1.txt");
ofstream out("roll.txt");
if(!in)
{
cout<<"error"< return 1;
}
while(in>>A[i].x>>A[i].xuehao>>A[i].name>>A[i].Class)
{
cout< i++;
}
srand((unsigned)time(NULL));
cout<<"下面随机抽取5位同学"< for(i=0 ;i<5 ;i++ )
{
int x=rand()%83;
cout< < < < < out < < < < < }
// cout<<"输入想操作的班级"< //string Class1;
//cin>>Class1;
//string ss="计科46(2)班";
// if(strcmp(Class1.c_str(),ss.c_str())==0)
//{
// for(i=0 ;i<83 ;i++ )
//{
// if(strcmp((A[i].Class).c_str(),ss.c_str())==0)
// cout< // < //< //< //< // }
// }
in.close();
out.close();
return 0;
}

#include
#include
#include
using namespace std;
int main()
{
char f[100];
cin>>f;
ifstream in(f);//很气，这里（）要地址= =，
if(!in)
{
cout<<"erroe"< return 1;
}
string s;
int duan=0;
for(int i=0 ;;i++ )
{
if(getline(in,s))
{
duan++;
cout< }
else break;
}
in.clear();//!!
in.seekg(0);//!!这两行代码是返回文件的开头（in.seekg(xx,ios::beg)是返回到开头后第xxx位；
char ss;
int z=0,zz=0,zzz;
while (in>>ss)
{
zz++;
if(ss>=‘A‘&&ss<=‘z‘)
z++;
}
in.clear();
in.seekg(0);
string sox;
int sox_=0;
while(in>>sox)
sox_++;
int shuru;
cout<<"看文章的词数输入0"< cout<<"看文章的字数输入1"< cout<<"看标点一共多少输入2"< cout<<"看文章段落输入3"< while(cin>>shuru)
{

switch (shuru)
{
case 0:
cout<<"文章的词数为:"< break;
case 1:
cout<<"文章的字数为："< break;
case 2:
cout<<"标点为："< break;
case 3:
cout<<"文章一共："< break;
default:
break;
}
cout<<"看文章的词数输入0"< cout<<"看文章的字数输入1"< cout<<"看标点一共多少输入2"< cout<<"看文章段落输入3"< cout< }
in.close();
return 0;
}