Download and install Dev C++
Dev C++ download (Devshed C++) from https://sourceforge.net/projects/orwelldevcpp/. You can fee download dev c++ and install (You may use Dev C++ online)
Create C++ file
Open Dev C++ and create a new file
Write a first C++ program
- Press F11 from the keyboard
- Go to Execute => Compile & Run
- Click on Compile & Run icon
Let us explain the program line by line
Line 1:
#include is C++ header file from C++ library. It provides us cout word to display output (and also cin to get input). C++ contains several header files and we can use them. Iostream C++ header file is used to get input from the user and display output to the screen
Line 2:
using namespace std c++ let us use cin and cout word in a simple direct way. Without writing it, we have to write std:: with all cout’s and cin’s in the program like std::cout<<”Hello World!”;
Line 3:
int main() This is the main function of the program where control starts execution.
Line 4:
Curly brackets {} is the body of this function. Program starts its execution from the body of the main function. Don't worry if you don't understand how #include , using namespace std and int main() works. It will be covered in coming tutorials.
Line 5,6:
{ cout << "Hello World! "; }
{ is open curly bracket to start body of main function. cout c++ used together with the insertion operator (<<) to output/print text on the screen. In our example, it will output "Hello World".
} is the close curly bracket to close the main function.
Note:
All statements of C++ end with a semicolon ;
Remember:
You can insert empty lines (white spaces) between code lines because C++ compiler ignores these lines. cin strings is used to get user input, will be covered in the next lesson.
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