读取特定格式的文件
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我有一个相当简单的C ++问题，但是从C背景开始，我并不真正了解C ++的所有I / O功能。所以这是问题所在：
我有一个具有特定格式的简单.txt文件，该文本文件如下所示：
123 points are stored in this file
pointer number | x-coordinate | y-coordinate
0 1.123 3.456
1 2.345 4.566
.....
int lines;
ifstream file(\"input.txt\");
file >> lines;
没有找到相关结果
已邀请:
3 个回复
物崎巩
std::ifstream file(\"input.txt\"); std::string ignore; int ignore2; int lines; double x, y; file >> lines; std::getline(ignore, file); // ignore the rest of the first line std::getline(ignore, file); // ignore the second line for (int i=0; i<lines; i++) { file >> ignore2 >> x >> y; // read in data, ignoring the point number std::cout << \"(\" << x << \",\" << y << \")\\n\"; // show the coordinates. }捕暑句簿姓
#include <cstddef> #include <limits> #include <string> #include <vector> #include <fstream> struct coord { double x, y; }; std::vector<coord> read_coords(std::string const& filename) { std::ifstream file(filename.c_str()); std::size_t line_count; file >> line_count; // skip first two lines file.ignore(std::numeric_limits<std::streamsize>::max(), \'\\n\'); file.ignore(std::numeric_limits<std::streamsize>::max(), \'\\n\'); std::vector<coord> ret; ret.reserve(line_count); std::size_t pointer_num; coord c; while (file >> pointer_num >> c.x >> c.y) ret.push_back(c); return ret; }倾坞髓
char buffer[256]; while (! file.eof() ) { myfile.getline (buffer,100); cout << buffer << endl; }while ((ch = file.get()) != EOF) { }