#include<iostream> #include<fstream> using namespace std; int main(){ ofstream fout("3.txt",ios_base::app); fout<<"merge successfuly."; if(!fout.is_open()) { cerr<<"ERROR:Cannot open txt."<<endl; exit(0); } system("pause"); fout.close(); return 0; }
//utils.h //这个头文件里包含了可用工具函数的声明 #include <string> using std::string; // 函数声明 // 返回当前系统时间,格式诸如20190611 string getCurrentDate(); //utils.cpp #include "utils.h" #include <ctime> using std::string; const int SIZE = 20; // 函数功能描述:返回当前系统日期 // 参数描述:无参数 // 返回值描述:以string类型返回系统当前日期,格式诸如20190611 string getCurrentDate() { time_t now = time(0); // 获取当前系统日历时间 struct tm *local_time = localtime(&now); // 把系统日历时间转换为当地时间 char date[SIZE]; strftime(date, SIZE, "%Y%m%d", local_time); return (string(date)); } #include<iostream> #include<fstream> #include<istream> #include<ctime> #include<string> #include"utils.h" #include<cstdlib> using namespace std; //struct student //{ // int id1,id2; // string name,classroom; //}; int main () { string file; string namefile=getCurrentDate(); cout<<"输入名单列表文件名:"; cin>>file; ifstream fin; ofstream fout; fin.open(file); if(!fin.is_open()) { cerr<<"Fail to open"<<file<<endl; exit(0); } fout.open(namefile); if(!fout.is_open()) { cerr<<"Fail to open"<<namefile<<endl; exit(0); } //从文件file中抽取n个人 int n; cout<<"输入随机抽点人数:"<<endl; cin>>n; //unsigned int a[n]; int id; string s,b[84]; for(int j=1;j<=83;j++) { getline(fin,s); b[j]=s; } srand((unsigned)time(0)); for(int i=0;i<n;i++) { id=1+rand()%83; cout<<b[id]; cout<<endl; fout<<b[id]; fout<<endl; } fin.close(); fout.close(); return 0; }
#include<iostream> #include<fstream> #include<cstring> #include<string> #include<cstdlib> using namespace std; bool fun(char ch)//判断是字符还是数字 { if(ch>=‘A‘&&ch<+‘Z‘||ch>=‘a‘&&ch<=‘z‘||ch==‘.‘||ch==‘,‘||ch==‘ ‘) return true; else return false; } void count(fstream &file,int a[]) { char str[100]; while(file.getline(str,100)) { int t=0; for(int i=0;i<strlen(str);i++) { if(str[i]==‘ ‘||str[i]==‘.‘&&str[i+1]!=‘.‘||str[i]==‘\n‘) { a[1]++; } if(fun(str[i])) { a[0]++; t++;//用来区分是不是一空行 } } if(t!=0) a[2]++; t=0; } } int main () { char filename[100]; int a[3]={0}; cout<<"请输入文件名:"; cin.getline (filename,100); fstream fin(filename,ios::in); if(!fin.is_open()) { cerr<<"Fail to open "<<filename<<endl; exit(0); } count(fin,a); cout<<"字符数:"<<a[0]<<endl; cout<<"单词数:"<<a[1]<<endl; cout<<"行数:"<<a[2]<<endl; fin.close(); return 0; }
原文:https://www.cnblogs.com/libing-072921/p/11031802.html