Addition of two variables

Same as the last sum/addition post, but I introduce variables. The variables are entered in the code, the program will not ask for them. Then the program work with the numbers and show the result.

#include <stdio.h>

main()
{
      int firstNumber;
      int secondNumber;
      int addition;
     
      firstNumber = 234;
      secondNumber = 567;
      addition = firstNumber + secondNumber;
      printf("Your addition is %d", addition);
      getchar();
}