Hello, I'm trying to print characters in the console at specified coordinates. Up to now I have been using the very ugly printf("\033[%d;%dH%s\n", 2, 2, "str"); But I just had to ask whether C++ had any other way of doing this. The problem is not even that it's ugly, the problem comes up when I try to make myself a prettier function lik...
I'm writing a set of unit tests that write calculated values out to files. Each test produces a square matrix that holds anywhere from 50,000 to 500,000 doubles, and I have a total of 128 combinations of test cases. Is there any significant overhead involved in writing cout statements and then piping that output to files, or would I be...
I want cout to output an int with leading zeros, so the value 1 would be printed as 001 and the value 25 printed as 025 .. you get the idea .. how can I do this? Thanks. ...
Can a windows message box be display using the cout syntax? I also need the command prompt window to be suppressed / hidden. There are ways to call the messagebox function and display text through its usage, but the main constraint here is that cout syntax must be used. cout << "message"; I was thinking of invoking the VB msgbox co...
When I construct a boost::options_description instance like options.add_options() ("double_val", value(&config.my_double)->default_value(0.2), "it's a double"); and later want to have the automated output of the options that are available for my program, and put std::cout << options << std::endl; the default value 0.2 is shown wi...
I'm trying to get a line as input from the command line. My problem is that I'm not getting the whole line, but it's being tokenized by space. So if I entered something such as "I like Math a lot" instead of getting "you enterend: I like Math a lot" I get the follwoing: EDITING MODE: Enter a command i like Math a lot you entered i ...
I noticed if I print out a long string(char*) using cout it seems to print 1 character at a time to the screen in Windows 7, Vista, and Linux(using putty) using Visual C++ 2008 on Windows and G++ on Linux. Printf is so much faster I actually switched from cout to printf for most printing in a project of mine. This is confusing me because...
When you create a C++ console application under Windows you automatically get the console window created for you and std::cout outputs to the console window. I have a GUI application for which I also want to create a console window. I can create the console window using the AllocConsole() function, but how do I redirect / attach std::c...
Hi all, I've read a bunch of posts regarding redirecting std::cout to stringstreams, but I'm having problem reading the redirected string. std::stringstream redirectStream; std::cout.rdbuf( redirectStream.rdbuf() ); std::cout << "Hello1\n"; std::cout << "Hello2\n"; while(std::getline(redirectStream, str)) { // This does not work - ...
After performing some tests I noticed that printf is much faster than cout. I know that it's implementation dependent, but on my Linux box printf is 8x faster. So my idea is to mix the two printing methods: I want to use cout for simple prints, and I plan to use printf for producing huge outputs (typically in a loop). I think it's safe t...
Right now, I have a console application I'm working on, which is supposed to display and update information to the console at a given interval. The problem I'm having is that with a carriage return, I can only update one line of text at a time. If I use a newline, the old line can no longer be updated using a carriage return. What can I...
the following code: myQueue.enqueue('a'); myQueue.enqueue('b'); cout << myQueue.dequeue() << myQueue.dequeue(); prints "ba" to the console while: myQueue.enqueue('a'); myQueue.enqueue('b'); cout << myQueue.dequeue(); cout << myQueue.dequeue(); prints "ab" why is this? It seems as though cout is calling the outermost (closest to t...
I'm running a program and redirecting cout to an outfile, like so: ./program < infile.in > outfile.o I want to be able to read in an option ('-h' or '--help') from the command line and output a help message to the terminal. Is there a way I can do this but still have the regular cout from the rest of the program go to the outfile?...
I have a class with a bool data member that is not initialized by the constructor. If I do cout << x.myBoolDataMember; where x is an object of this class in which the bool has not been initialized, I sometimes get a random number rather than 0 or 1. (I'm using gcc.) Is this behavior compliant with the Standard? ...
How do you get "absolutely positioned" columns with cout, that leftaligns text and right-aligns numbers? #include <iostream> #include <iomanip> using namespace std; struct Human { char name[20]; char name2[20]; char name3[20]; double pts; }; int main() { int i; Human myHumen[3] = { {"Mr", "Alan", "Turin...
I want to create a logger class such that with a functionality like this: Logger log; log << "Error: " << value << "seen" << endl; This should print me a custom formatted message. E.g. "12-09-2009 11:22:33 Error 5 seen" My simple class currently looks like this: class Logger { private: ostringstream oss; public: ...
I'm trying to simply print out the values contained in an array. I have an array of strings called 'result'. I don't know exactly how big it is because it was automatically generated. From what I've read, you can determine the size of an array by doing this: sizeof(result)/sizeof(result[0]) Is this correct? Because for my program, ...
cout << hex << 11 << endl; cout << 12 << endl; will print : a b If I cout 13, it will be printed as 'c'. How do I remove the hex modifier from now on so it would just print 13? This is probably simple but I tried looking for the answer elsewhere. Thanks. ...
Hi, I tried the following code: #include <iostream> using std::cout; using std::ostream; class X { public: friend ostream& operator<<(ostream &os, const X& obj) { cout << "hehe"; // comment this and infinite loop is gone return (os << obj); } }; int main() { X x; cout << x; return 0; }...
Hi In such code, what it is called, \\n like this? cout<<"Hello\\n \'world\'!"; What's the basic rule about such characters? ...