实验6
Part 2
#include <iostream> #include <fstream> #include <string> #include <cstdlib> using namespace std; int main() { string filename1, filename2, newfilename; cout << "输入要合并的两个文件名: " ; cin >> filename1 >> filename2; cout << "输入合并后新文件名: " ; cin >> newfilename; ofstream fout; // 输出文件流对象 ifstream fin; // 输入文件流对象 fin.open(filename1); // 将输入文件流对象fin与文件filename1建立关联 if(!fin.is_open()) { // 如果打开文件失败,则输出错误提示信息并退出 cerr << "fail to open file " << filename1 << endl; system("pause"); exit(0); } fout.open(newfilename); // 将输出文件流对象fout与文件newfilename建立关联 if(!fin.is_open()) { // 如果创建/打开文件失败,输出错误提示信息并退出 cerr << "fail to open file " << newfilename << endl; system("pause"); exit(0); } char ch; // 从文件输入流对象fin中获取字符,并将其插入到文件输出流对象fout中 while(fin.get(ch)) fout << ch; fin.close(); // 关闭文件输入流对象fin与文件filename1的关联 fout << endl; // 向文件输出流对象fout中插入换行 fin.open(filename2); // 将输入文件流对象fin与文件filename2建立关联 if(!fin.is_open()) { // 如果打开文件失败,则输出错误提示信息并退出 cerr << "fail to open file " << filename2 << endl; system("pause"); exit(0); } // 从文件输入流对象fin中获取字符,并将其插入到文件输出流对象fout中 while(fin.get(ch)) fout << ch; fin.open("3.txt",ios::app); fout<<"\nmerge successfully."<<endl; fin.close(); // 关闭文件输入流对象fin与文件filename2的关联 fout.close(); // 关闭文件输出流对象fout与文件newfilename的关联 system("pause"); return 0; }
Part 2
1:
#include <iostream> #include <string> #include <fstream> #include <cstdlib> #include <ctime> #include <vector> #include "utils.h" using namespace std; static int is_choose[83]={0}; int main() { string filename,listfilename; filename = getCurrentDate(); int n; cout<<"输入名单列表文件名:"; cin>> listfilename; cout<<"输入随机抽点人数:"; cin>>n; cout<<"随机抽点中..." <<endl; ofstream fout;//输出文件流对象 ifstream fin;//输入文件流对象 fin.open(listfilename); if(!fin.is_open()){ cerr<<"fail to open file"<<filename<<endl; system("pause"); exit(0); } fout.open(filename); if(!fin.is_open()){ cerr<<"fail to open file"<<filename<<endl; system("puase"); exit(0); } srand((unsigned)time(NULL)); vector <string> num; string leftcon; while (getline(fin,leftcon)) num.push_back(leftcon); for(int i=1;i<=n;i++){ int choose_num=rand()%83+1; if(is_choose[choose_num]==1){ i--; continue; } is_choose[choose_num]=1; cout<<num[choose_num]<<endl; fout<<num[choose_num]<<endl; } fin.close(); fout.close(); system("pause"); return 0; }
2:
#include <iostream> #include <string> #include <fstream> #include <cstdlib> using namespace std; int main(){ string filename; ifstream fin; ofstream fout; int num=0,num1=0,line=0; cout<<"输入要统计的英文文本文件名:"; cin>>filename; fin.open(filename); if(!fin.is_open()){ cout<<"fail to open"<<endl; exit(0); } string a; string b[10000]; int i,j; while (getline(fin,a)){ b[line]=a; line++; j=a.length(); for(i=0;i<j;i++){ if(a[i]==' ') num1++; } num1++; } for(i=0;i<line;i++){ j=b[i].length(); num+=j; } fin.close(); cout<<"字符数:"<<num<<endl; cout<<"单词数:"<<num1<<endl; cout<<"行数:"<<line<<endl; return 0; }