实验七

#include<iostream>
using namespace std;
int main() {
    ios_base::fmtflags original_flags = cout.flags();//保存现在的格式化参数
    cout << 812 << ‘|‘;
    cout.setf(ios_base::left, ios_base::adjustfield);//设置左对齐
    cout.width(10);//设置输出宽度为10
    cout << 813 << 815 << ‘\n‘;
    cout.unsetf(ios_base::adjustfield);//取消左对齐
    cout.precision(2);//设置精度
    cout.setf(ios_base::uppercase | ios_base::scientific);//使用科学计数法输出。
    cout << 831.0;
    cout.flags(original_flags);//恢复初始参数
    return 0;
}

#include<iostream>
#include<fstream>
using namespace std;
int main() {
    ofstream a("test1.txt");
a << "已成功写入文件！";
    a.close();
    return 0;
}

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
int main() {
    ifstream a("test1.txt");
    string s;
    a >> s;
    cout << s;
    return 0;
}

#include<iostream>
#include<fstream>
#include<string>
#include<cstdlib>
#include<ctime>
using namespace std;
struct {
    int n;
    string j, k, l;
}s[100];
int main() {
    ifstream a("list.txt");
    int i;
    for (i = 0; i < 83; i++)a >> s[i].n >> s[i].j >> s[i].k >> s[i].l;
    a.close();
    ofstream b("roll.txt");
    srand((unsigned)time(NULL));
    for (i = 1; i <= 5; i++) {
        int m = 1 + rand() % 83;
        cout << s[m].n << " "<<s[m].j <<" "<< s[m].k <<" "<< s[m].l<<endl;
        b << s[m].n << " "<<s[m].j <<" "<< s[m].k <<" "<< s[m].l<<endl;
    }
    b.close();
    return 0;
}

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
int main() {
    ifstream is("article.txt");
    int a = 0; int b = 0; int c = 0;
    string s;
    int m;
        while (getline(is, s)) {
            m = s.size();
            a++;
            b += m;
            for (int i = 0; i < m; i++) {
                if (s[i] >= ‘A‘&&s[i] <= ‘Z‘ || s[i] >= ‘a‘&&s[i] <= ‘z‘) {
                    if (s[i + 1] >= ‘!‘&&s[i + 1] <= ‘/‘ || s[i + 1] == ‘ ‘ || s[i + 1] >= ‘:‘&&s[i + 1] <= ‘?‘) {
                        c++;
                    }
                }
            }
        }
    is.close();
    cout << "Lines：" << a << " Letters：" << b<< " Words：" << c<< endl;
    return 0;
}