I am new to C++ and trying my hands on std::vector. But for some reason even a single std::cout doesn't work with the vector I have declared.
Here is the sample code:
#include <iostream>
#include <vector>
using namespace std;
int main(){
std::vector <int> test_score;
test_score.push_back(10);
cout << test_score.at(0);
return 0;
}
The terminal output shows nothing. Here it is.
The same code works fine on IDEs like CodeBlocks.
Just for your info, your code works fine on my terminal without the image description part.
Maybe try to comment these lines out as they are not involve in the problem or try to compile a Hello World program first may help.
Related
I have a weird problem when trying to print out the content of a vector.
I'm using Visual Studio Code with the CMake extension.
I can print out simple text using cout
#include <iostream>
#include <vector>
using namespace std;
int main() {
cout << "test" << endl;
return 0;
}
But I can't print out the vectors content
#include <iostream>
#include <vector>
using namespace std;
int main() {
vector<int> test = {1,2,3};
cout << "test" << endl;
cout << test[1] << endl;
return 0;
}
I've never really worked with C++ vectors, so I'm probably missing something fairly obvious but I followed a C++ vector tutorial step by step and for them, the output works fine.
Cheers,
Luca
I'm new to C++ and have exactly the same problem.
Temporary workaround as posted by Luckylone here
would be to copy libstdc++-6.dll from your mingw64\bin folder into your project folder.
Something is messing up our link with the resources even though folders are properly added to system PATH.
EDIT: After an afternoon of troubleshooting, I've solved my problem by uninstalling compilers (originally provided through WinLibs) and reinstalling them using MSYS2.
Delete the existing Mingw64 folder, remove the PATH variables, then carefully follow these instructions. Keep in mind that I had to add mingw64/bin to both user and system Path, and restart VS Code before damn std::vector finally started to print.
I'm getting started with C++ and am trying to work with vectors and printing stuff. I am using Windows 10, writing my code in Visual Studio Code, I just downloaded the MinGW-g++ compiler, and am trying to run my code in CMD.
This is my code, I've tried printing different things, and it's not even printing this "Hello". I've also tried using << endl; which also prints nothing. I also tried adding and remove a "return 0;" at the end but it changed nothing. The program compiles just fine. Any advice?
#include <iostream>
using namespace std;
int main(void)
{
std::cout << "Hello";
std::cout.flush();
}
Hi I am new to C++ and Code::Block
I am trying to make a simple code to test it, using strings.
when I compile the code there is no problem, but when I try to debug it, Code::Block gives me the following warning:
Cannot open file:
File:../../../../../src/gcc-4.9.2/libgcc/unwind-sjlj.c
Info: "Multiple information windows with the same message have been
supressed."
Image of the error FYI:
Part of the code that gives me an error.
inside main function
#include <iostream>
#include <string>
int main ()
{
std::mystring("What's wrong with strings");
return 0;
}
I realise that this error only occurs when I try to debug a string or a file containing a string.
Any help would be appreciated.
some other information that might help:
Code::Block 16.01
Compiler MinGW gcc4.9.2
Windows 7 Professional 32 bits SP1
First of all, to use strings you must include the file header string. And the name of the type string is..std::string, not std::mystring.
#include <string>
int main(int argc, char** argv)
{
std::string mystring("Nothing's wrong with strings");
return 0;
}
#include <iostream>
using namespace std;
int main ()
{
string mystring = "Whats wrong with my string";
return 0;
}
If you write it in the following way, it should work.
It's safer to define strings like I showed it. It will be also easier for you if you add using namespace std in the beginning of every program if you are new to C++.
I was writing a small program in C++ to translate infix notation to polish notation and RPN, but after running it a ton of mistakes popped up in xiosbase file. I tried to run a simpler code but xiosbase mistakes are still there.I am just starting to code and I have no idea how header files work (and any other file except the one I am writing).
This is Hello World.
#include <iostream>
#include <cstdlib>
using namespace std;
int main()
{
cout << "Hello, world!" << endl;
system("pause");
return 0;
}
and here are all the mistakes I get:
Keep in mind that I am a massive newbie
#include <iostream>
#include <string.h>
using namespace std;
int main ()
{
string st = "Hello world";
return 0;
}
and
#include <string>
int main ()
{
std::string st = "Hello world";
return 0;
}
I tried compiling this code using minGW compiler on netbeans. It brings up the following error after the successful build.
RUN FAILED (exit value -1,073,741,511, total time: 93ms)
But it works clean when strings are not used. I would like to know what I am doing wrong here. Thanks in advance.
Use c++ strings and don't use using namespace std:
#include <string> //c++ string header
int main ()
{
std::string st = "Hello world";
return 0;
}
#include <string.h> is the old C-style string header and most likely isn't what you want to use here. See this question for more details: Difference between <string> and <string.h>?
Note: If you really wanted the old C-style strings then you really should be using #include <cstring> because this will put those functions into the std namespace and won't cause any namespace pollution that can lead to other undesirable outcomes.
Likely what happened was that you used the old style string header and didn't properly initialize those strings. The old C-style strings don't have a constructor and operator= defined like the std::string class.
Edit: After looking at the Netbeans forum this is a problem with Netbeans and not a c++ issue. Try changing the output to an external terminal in Netbeans. Or run the program directly from the command line. If these approaches don't fix the problem or are undesirable then make a post over on the Netbeans forum. Also have a look at this question: Program won't run in NetBeans, but runs on the command line!
Uss #include <string> instead of string.h