C++实验七

11-7

#include<iostream>
using namespace std;
int main()
{
    ios_base::fmtflags original_flags=cout.flags();// 保存一些参数的设置 
    cout<<812<<'|';
    cout.setf(ios_base::left,ios_base::adjustfield);// 对齐方式变为左对齐 
    cout.width(10);// 输出宽度变成10 
    cout<<813<<815<<'\n';
    cout.unsetf(ios_base::adjustfield);// 去除现在的对齐方式 
    cout.precision(2);
    cout.setf(ios_base::uppercase|ios_base::scientific);// 使用科学计数法 
    cout<<831.0;
    cout.flags(original_flags);// 恢复cout原有的设置 
    return 0;
 }

11-3

#include<fstream>
using namespace std;
int main()
{
    ofstream file;
    file.open("test1.txt",ios_base::binary);
    file<<"已成功写入文件！";
    file.close();
    return 0;
}

11-4

#include<iostream>
#include<fstream>
#include<sstream>
using namespace std;
int main()
{
    ifstream file;
    file.open("list.txt");
    ostringstream tmp;
    tmp<<file.rdbuf();
    string s=tmp.str();
    cout<<s;
    file.close();
    return 0;
}

list

#include<iostream>
#include<fstream>
#include<string> 
#include<stdlib.h>
#include<ctime>
#include<windows.h> 
using namespace std;
struct student
{
    int num;
    string ID,name,cls;
}stu[83];

int main()
{
    ifstream cinlist("list.txt");
    for(int i=0;i<83;i++)
    {
        cinlist>>stu[i].num>>stu[i].ID>>stu[i].name>>stu[i].cls;
    }
    cinlist.close();
    ofstream coutlist("roll.txt");
    for(int j=0;j<5;j++)
    {
        int a=0;
        Sleep(850);
        srand((unsigned)time(NULL));
        a=rand()%83;
        cout<<stu[a].num<<" "<<stu[a].ID<<" "<<stu[a].name<<" "<<stu[a].cls<<endl;
        coutlist<<stu[a].num<<" "<<stu[a].ID<<" "<<stu[a].name<<" "<<stu[a].cls<<endl;
    }
    coutlist.close();
    return 0;
}

字符数统计

#include<iostream>
#include<cstring>
#include<fstream>
#include<sstream>
using namespace std;
int main()
{
    string filename;
    cout<<"请输入你想要生成的文件名："<<endl;
    cin>>filename;
    getchar();
    ifstream cinfile(filename.c_str());
    string sen;
    while(getline(cinfile,sen))
{
    int charnum=0,wordnum=0,linenum=0;
    int a=sen.size();
    for(int i=0;i<a;i++)
    {
        charnum++;
        if(sen[i]==' '||sen[i]==','||sen[i]=='!')
        wordnum++;
    }
        linenum++;
        cout<<"行数:"<<linenum<<" "<<"列数："<<charnum<<" "<<"单词数："<<wordnum<<endl;
}
    return 0;
}

做不出来，找不到文件，不知道为啥书上也找不到。

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