It’s not correct to say “floating point is inaccurate”, although I admit that’s a useful simplification. If we used base 8 or 16 in real life then people around here would be saying “base 10 decimal fraction packages are inaccurate, why did anyone ever cook those up?”. The problem is that integral values translate exactly … Read more
To answer the original question: Anything that can be done using stdio can be done using the iostream library. Disadvantages of iostreams: verbose Advantages of iostreams: easy to extend for new non POD types. The step forward the C++ made over C was type safety. iostreams was designed to be explicitly type safe. Thus assignment … Read more
The code cin >> y; only reads in one word, not the whole line. To get a line, use: string response; getline(cin, response); Then response will contain the contents of the entire line.
I think “APP_STL:=stlport_static” must be in Application.mk file. Create a “Application.mk” file and write “APP_STL:=stlport_static” in it.
Man, this is not so good, because Java is cross-platform and ‘/dev/null’ is Unix specific (apparently there is an alternative on Windows, read the comments). So your best option is to create a custom OutputStream to disable output. try { System.out.println(“this should go to stdout”); PrintStream original = System.out; System.setOut(new PrintStream(new OutputStream() { public void … Read more
I don’t know which one will be faster, but if I had to guess I’d say your second example is, especially since you’ve called the reserve member function to allocate a large space for expansion. If you’re only concatenating strings use string::append (or string::operator+=). If you’re going to convert numbers to their string representation, as … Read more
Each translation unit that includes <iostream> contains a copy of ios_base::Init object: static ios_base::Init __ioinit; This object is used to initialize the standard streams (std::cout and its friends). This method is called Schwarz Counter and it ensures that the standard streams are always initialized before their first use (provided iostream header has been included). That … Read more
string str,sub; // str is string to search, sub is the substring to search for vector<size_t> positions; // holds all the positions that sub occurs within str size_t pos = str.find(sub, 0); while(pos != string::npos) { positions.push_back(pos); pos = str.find(sub,pos+1); } Edit I misread your post, you said substring, and I assumed you meant you … Read more
What you need to do is write your own stream buffer: When the stream buffer is flushed you output you prefix characters and the content of the stream. The following works because std::endl causes the following. Add ‘\n’ to the stream. Calls flush() on the stream This calls pubsync() on the stream buffer. This calls … Read more
In short: iostream.h is deprecated—it is the original Stroustrup version. iostream is the version from the standards committee. Generally, compilers point them both to the same thing, but some older compilers won’t have the older one. In some odd cases, they will both exist and be different (to support legacy code) and you then must … Read more