Make a button that when held down, makes an LED blink. Use Arduino C++ Code Only!

I am learning C++ and would like to make cleaner code. I am learning on Udemy.com how having the main at the bottom of the program helps when making blocks of code. What I would like to do is take some code I already have, and have the user enter two prime colors to make a mixed color, then ask the user if they would like to mix another color with two of the same prime and one other prime color to get: yellow-green, yellow-orange, orange-red, red-purple, blue-green, and blue-purple.  Is my logic flawed? What is the correct logic? How would I set up this code to have different functions outside the main with the main at the bottom? I know it is supposed to read the information first somehow. I just can't process how to write it. #include <iostream>#include <string> using namespace std; int main() {    string arr[] = {"red", "blue", "yellow"};    int color1, color2;    string mixedColor;    char choice;     do {        cout << "Enter one prime color followed by a second…

I need to write a c++ code that finds the shortest path from a given path. The white spaces means the path.  Given example path: XXXX        XXX   XXX   X

I need help making this program in C programming. Please look at the pictures provided at that helps. Thank You!