std::ifstream comport; std::string linein; std::ios_base::iostate exceptionMask = comport.exceptions() | std::ios::failbit; comport.exceptions(exceptionMask); try { comport.open("COM6:", std::ifstream::in); } catch (std::ios_base::failure &e) { std::string erroropen( e.what...
C++ 通过以下几个类支持文件的输入输出： ofstream: 写操作（输出）的文件类 (由ostream引申而来) ifst...
stringstream的构造函数原形如下：stringstream::stringstream(string str);include <iostream> include <sstream> include <string> using namespace std;int main(){ stringstream ostr("ccc");ostr.put('d');ostr.put('e');ostr<<"fg";string gstr = ostr.str();cout<<gstr<<endl;char a;o...
int main(){ifstream fin("1.txt",ios::in|ios::out|ios::app);while (fin)//直接对象名即可{int a;char str[10];fin >> a;fin >> str;cout << a << "+char" << str << endl;}return 0;}
ifstream的用法#include<fstream.h> #include<iostream.h> //usingnamespacestd; staticcharch; main() { ifstreaminfile(filename,ios::in); if(!infile) { cout<<"openerror!"<<endl; exit(1); } infile.get(ch); cout.put(ch); cout<<endl; system("pause"); } 为何我这样写的时候程序说...
std::ifstream ifs_map("in.txt"), ifs_content("in2.txt"); if (!ifs_map || !ifs_content) { std::cerr << "can't find the documents." << std::endl; return; } std::unordered_map<string, string> trans_map; for (string key, value; ifs_map >> key && getline(ifs_map, value...
ifstream的用法#include<fstream.h> #include<iostream.h> //usingnamespacestd; staticcharch; main() { ifstreaminfile(filename,ios::in); if(!infile) { cout<<"openerror!"<<endl; exit(1); } infile.get(ch); cout.put(ch); cout<&
=std::ios_base::in); (2) explicitbasic_ifstream(conststd::filesystem::path::value_type*filename, std::ios_base::openmodemode =std::ios_base::in); (3)(since C++17) explicitbasic_ifstream(conststd::string&filename, std::ios_base::openmodemode ...
ifstream infile(file2, ios::in); while (getline(infile, s)) cout << s << endl; infile.close(); } void search1(const char* fnd_file,const char*str) { string s; ifstream infile(fnd_file, ios::in); int linenum = 0; ...
leichen@gpu-compute4$ make g++ -Wall -pedantic-errors -g -w -lpthread -c rainfall.cpp -o rainfall.o rainfall.cpp: In function ‘int main(int, char**)’: rainfall.cpp:50:39: error: no matching function for call to ‘std::basic_ifstream<char>...