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  • 实验七

    11-7

    #include <iostream> 
    using namespace std;
    
    int main() {
    
        ios_base::fmtflags original_flags=cout.flags();
        //保存原有的输出设置 
        cout << 812 << '|';
        cout.setf(ios_base::left, ios_base::adjustfield);
        //输出左对齐 
        cout.width(10);
        //对下方输出的第一个值设置宽度 
        cout << 813 << 815 << '
    ';
        cout.unsetf(ios_base::adjustfield);
        //去掉左对齐的设置 
        cout.precision(2);
        //小数点后两位 
        cout.setf(ios_base::uppercase|ios_base::scientific);
        //用科学计数法表示 
        cout << 831.0;
        cout.flags(original_flags);
        //恢复原来的格式设置 
    
        
        return 0;
    } 

    11-3

    #include<fstream>
    #include<iostream>
    using namespace std;
    int main(){
        ofstream out;
        out.open("test1.txt");
        if(!out){
            cout<<"fail to open"<<endl;
            return 1;
        }
        out<<"已成功写入文件1"; 
        
        return 0;
    }

    11-4

    #include<fstream>
    #include<iostream>
    using namespace std;
    int main(){
        ifstream in;
        in.open("test1.txt");
        if(!in){
            cout<<"fail to open"<<endl;
            return 1;
        }
        
        string s;
        in>>s;
        cout<<s;
        in.close(); 
        
        return 0;
    }

    list

    #include<iostream>
    #include<fstream>
    #include<vector>
    #include<string>
    #include<iomanip> 
    #include<cstdlib>
    #include<time.h>
    using namespace std;
    
    class students {
    public:
        int n;
        long long int num;
        string name;
        string cla;
    };
    
    int main() {
        int t;
        ifstream infile;
        infile.open("list.txt");
        if (!infile) {
            cout << "fail to open" << endl;
            return 1;
        }
    
        vector<students> stu;
        students stu1;
        
        while (infile >> stu1.n >> stu1.num >> stu1.name >> stu1.cla) {
            stu.push_back(stu1);
        }
        
        cout<<stu.size()<<endl; 
        
        infile.close();
        
        ofstream outfile;
        outfile.open("roll.txt",ios::app);
        if (!outfile) {
           cout << "fail to open" << endl;
           return 1;
        }
        
        srand(time(0));
        for (int i = 0; i < 5; i++) {
            t=rand()%stu.size();
            
            cout << setfill(' ') << left << setw(4) << stu[t].n 
            << setfill(' ') << right << setw(11) << stu[t].num << ' ' 
            << setfill(' ') << left << setw(8) << stu[t].name
            << stu[t].cla << endl;
            
            outfile << setfill(' ') << left << setw(4) << stu[t].n 
            << setfill(' ') << right << setw(11) << stu[t].num << ' ' 
            << setfill(' ') << left << setw(8) << stu[t].name
            << stu[t].cla << endl;
        }
        
        char ch='Y';
        while(ch=='Y'){
            cout<<"是否继续点名?Yes(Y) or No(N)" << endl;
            while(cin>>ch){
               if(ch=='Y'){
                  t=rand()%stu.size();
               
                  cout << setfill(' ') << left << setw(4) << stu[t].n 
                  << setfill(' ') << right << setw(11) << stu[t].num << ' ' 
                  << setfill(' ') << left << setw(8) << stu[t].name
                  << stu[t].cla << endl;
               
                  outfile << setfill(' ') << left << setw(4) << stu[t].n 
                  << setfill(' ') << right << setw(11) << stu[t].num << ' ' 
                  << setfill(' ') << left << setw(8) << stu[t].name
                  << stu[t].cla << endl;
               }
               else
                 break;
            }
        }
        outfile.close();
    
        return 0;
    }

    English

    #include<fstream>
    #include<iostream>
    #include<string.h>
    #define N 1000 
    using namespace std;
    int main(){
        ifstream infile;
        infile.open("English.txt");
        
        if(!infile){
            cout<<"fail to open"<<endl;
            return 1;
        }
        
        int zifu=0,words=0,lines=0;
        
        char ch[N];
        while(infile.getline(ch,N)){
            for(int i=0;i<strlen(ch);i++){
                ++zifu;
                if(ch[i]=='.'||ch[i]==' ')
                ++words;
            }
            ++lines;
        }
        
    
        cout<<"num of zifu is "<<zifu<<endl
        <<"num of words is "<<words<<endl
        <<"num of lines is "<<lines;
        
        return 0;
    }

    这几天忙着刷oj,做的比较匆忙,有些附加没来及做,后面会带着补充的

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  • 原文地址:https://www.cnblogs.com/zhaoluolong/p/9205704.html
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