The application consists of a start button, which when pressed increases by one. When reaching the number 7, the screen color changes to red. When reaching the number 14, the screen color changes to orange. When reaching the number 21, the screen color changes to yellow. When reaching the number 28, the screen color changes to green. When reaching the number 35, the screen color changes to blue. When reaching the number 42, the screen color changes to indigo. When reaching the number 49, the screen color changes to purple. Finally, when reaching the number line, the numbering returns to zero again. The application consists of a start button, which when pressed increases by one. When reaching the number 7, the screen color changes to red. When reaching the number 14, the screen color changes to orange. When reaching the number 21, the screen color changes to yellow. When reaching the number 28, the color changes to green. When reaching the number 35, the screen color changes to blue. When reaching the number 42, the screen color changes to indigo. When reaching the number 49, the screen color changes to purple. Finally, when reaching the number line, the numbering returns to zero. Zero again