I'm trying to get this C++ code to input a series of numbers from a text file: int x = 0; cin >> x; ifstream iffer; int numbers[12]; iffer.open("input.txt"); for (int i = 0; i < 12; i++){ iffer >> numbers[i]; } This doesn't seem to work on the Mac. Every cell will equal to 0 regardless of the value...
Is there any good tutorial or code snippet out there on how to use OpenGL via C/C++ on the iPhone? ...
Is there a way to get an unsigned equivalent (same size) of a signed integral type in C++? I'm thinking along the lines of: template<typename T> struct get_unsigned { }; template<> struct get_unsigned<int> { typedef unsigned int type; }; ... template<typename T> void myfunc(T val) { get_unsigned<T>::type u = std::abs(val); ...
#include <iostream> #include <fstream> using namespace std; int main () { ofstream myfile; myfile.open ("test.txt"); return 0; } fstream is derived from iostream, why should we include both in the code above? I removed fstream, however, there is an error with ofstream. My question is ofstream is derived from ostream, why fstrea...
I experience the following problem while using legacy VC6. I just cann't switch to modern compiler, as I am working on a legacy code base. http://support.microsoft.com/kb/172396 Since there are no way to export map, my planned workaround is using static linking instead of dynamic linking. I was wondering whether you all had encountere...
What is the difference between: long myLong; float myFloat = (float) myLong; and: float myFloat = float(myLong); ...
i'm newby to C++. Small code as follows: int main(int argc, char* argv[]) { cout << "function main() .." << '\n'; char ch1; int int1; cin >> ch1; cin >> int1; cout << ch1 << '\n'; cout << int1 << '\n'; return 0; } when i run the program and input the following: function main() .. az i get : a 32767 i understand the 'a...
This seems to be weird: int main(int argc, char* argv[]) { cout << "function main() .." << '\n'; char ch = 0; double number_value=1.1; cin >> ch; cin.putback(ch); cin >> number_value; cout << "1 .. " << " " << cin.good() << " " << number_value << '\n'; cin >> number_value; cout...
I recently had an exchange with another C++ developer about the following use of const: void Foo(const int bar); He felt that using const in this way was good practice. I argued that it does nothing for the caller of the function (since a copy of the argument was going to be passed, there is no additional guarantee of safety with reg...
I'm having a weird problem with memset, that was something to do with a class I'm creating before it and a file I'm opening in the constructor. The class I'm working with normally reads in an array and transforms it into another array, but that's not important. The class I'm working with is: #include <vector> #include <algorithm> using ...
Hello All, I am building an application in C++, Mac OS X, Qt and using boost libraries. Every time i build a project I get a huge list of warnings only from boost libraries itself. I want to turn off them so that I can see only my project specific warnings and errors. Can anybody help me? Thanks, Rahul ...
I'm converting a project from vs2008 to vs2010 and getting linker errors for std:ifstream/ofstream error LNK2001: unresolved external symbol "__declspec(dllimport) public: bool __thiscall std::basic_ofstream<char,struct std::char_traits<char> >::is_open(void)const " (__imp_?is_open@?$basic_ofstream@DU?$char_traits@D@std@@@std@@QBE_NXZ) ...
How can I display a splash screen using C or C++ in Windows? What libraries or Windows components would be applicable? ...
I want to transfer files across the network using C or C++. What topics should I look up? How can I do this? ...
Is there an open source project that allows for an auto-update of windows binaries? The Luau update library is very similar to what I'm looking for but it was abandoned in 2005. ...
Shouldn't the compiler automatically cast to a double in the following? At least according to Walter Savitch. #include <iostream> #include <cmath> using namespace std; int main(){ int k; for(k = 1; k <= 10; k++) cout << "The square root of k is: " << sqrt(k) << endl; return 0; }//error C2668: 'sqrt' : ambiguous call...
I am dumping \t delimited data using using OutputDebugString and then use ex-Sysinternals DebugView to capture it. The problem is that all the data in DebugView appear to be space delimited, hence I need to perfrorm CTRL+H "\x20" "t" to replace spaces with the tabs before I can use it (I really need tab delimited data). Is there anywa...
I search for the function that run programm by path, and working of main programm is stopped until run second programm. Can i do that by using System.Diagnostics.Process class? ...
bool is_something_ok(int param,SomeStruct* p) { bool is_ok = false; // check if is_ok if(is_ok) // set p to some valid value else // set p to NULL return is_ok; } this function return true and set p to a valid value if "something is ok" otherwise return false and set p to NULL Is that a good or bad ...
I have built an open-source application from the source code. Unfortunately, the original executable runs significantly faster. I tried to enable few compiler optimizations, but the result wasn't satisfactory enough. What else do I need to make in Visual Studio 2008 to increase the executable performance? Thanks! ...