c++中ifstream一次读取整个文件 读取至char*的情况 std::ifstream t; int length; t.open("file.txt"); // open input file t.seekg(0, std::ios::end); // go to the end length = t.tellg(); // report location (this is the length) t.seekg(0, std::ios::beg); // go back to
#include <sstream>#include <iostream>int main() { unsigned int x; std::stringstream ss; ss << std::hex << "FF"; ss >> x; // output it as a signed type std::cout << static_cast<int>(x) << std::endl;