Write a Hello World application with C++

Launch Geany. From the desktop, select Applications > Development > Geany.

Select Project > New. Name the project hello_world_cpp.

The fields represent the following:

• Name — The name of the project.
• Filename — The filepath of the project, where the project settings are stored. This path generally ends in .geany
• Base path — The base path of all files making up the project.

Click OK when prompted to create the directory.

Write a Hello World sample application. This example uses:

#include <iostream>

int main (int argc, char **argv)
{
    std::cout << "Hello World!";

    exit(0);
}

Select File > Save As, and save it as hello_world.cpp.

Select Build > Compile to compile the source.

Select Build > Build to create an executable for the code.

Select Build > Execute to execute the code in a terminal window:

Try the linting function by adding the following code before your main() function:

std::string hi_again("hello");

Add the following after "Hello World!" print statement:

std::cout << hi_again;

Your code should look like the following:

Select Build > Lint. You should see a warning about a non-const global variable:

Add in a const before the global string variable and run lint again. The warning should disappear:

Next, try debugging the Hello World sample. Select Build > Set Build Commands.

Select the Build tab, then update the Compile and Build commands to include the -g flag:

Select Debug > Setup Program to set up the program to be debugged.

Enter the full path to the hello_world executable in the Executable field (e.g., /data/home/qnxuser/projects/hello_world_cpp/hello_world), then click OK.

Set a breakpoint on the print statement. Click the print statement line in the IDE, then select Debug > Toggle Breakpoint. A blue dot appears next to the respective line number

Select Debug > Run/Continue to run the debugger.

Once the breakpoint has been hit, select Debug > Run/Continue or Debug > Step Over.