C++读取指定文件内容

#include <iostream>#include <fstream>#include <string>using namespace std;int main(int argc, char* argv[]){if(argc != 2){cout<<"usage: readfile <filename>"<<endl;return -1;}char* filePath = argv[1];ifstream fin;fin.open(filePath, ios::in);if( !fin.is_open() ){cout<<"cannot open file \""<<filePath<<"\"."<<endl;cout<<"check if the file exists."<<endl;return -1;}string s;while( getline(fin, s) )cout<<s<<endl;fin.clear();fin.close();return 0;}