adding in cycling mechanism

Main.c

@@ -1,7 +1,95 @@
 
 #include <stdio.h>
+#include <wiringPi.h>
 
-void main(void)
+// these are based on the wiringPi pin numbers
+#define YELLOW_PIN 26 // GPIO 12
+#define GREEN_PIN 27  // GPIO 16
+#define BLUE_PIN 28   // GPIO 20
+#define RED_PIN 29    // GPIO 21
+
+#define BUTTON_PIN 1 // GPIO 18
+
+enum LED_STATE
+{
+    BLANK = 0,
+    YELLOW,
+    GREEN,
+    BLUE,
+    RED,
+    NUM_LEDS
+};
+
+int main(int argc, char *argv[])
 {
     printf("Starting program \n");
+    printf("Number of arguments: %d\n", argc);
+
+    printf("Program name: %s\n", argv[0]); // argv[0] holds the program name
+
+    for (int i = 1; i < argc; i++)
+    { // Iterate through arguments starting from index 1
+        printf("Argument %d: %s\n", i, argv[i]);
+    }
+
+    wiringPiSetup();
+
+    pinMode(YELLOW_PIN, OUTPUT);
+    pinMode(GREEN_PIN, OUTPUT);
+    pinMode(BLUE_PIN, OUTPUT);
+    pinMode(RED_PIN, OUTPUT);
+
+    pinMode(BUTTON_PIN, INPUT);
+
+    enum LED_STATE ledState = BLANK;
+
+    while (1)
+    {
+        if (digitalRead(BUTTON_PIN) == HIGH)
+        {
+            ledState = (ledState + 1) % NUM_LEDS;
+        }
+        else
+        {
+            continue;
+        }
+
+        switch (ledState)
+        {
+        case BLANK:
+            digitalWrite(YELLOW_PIN, LOW);
+            digitalWrite(GREEN_PIN, LOW);
+            digitalWrite(BLUE_PIN, LOW);
+            digitalWrite(RED_PIN, LOW);
+            break;
+        case YELLOW:
+            digitalWrite(YELLOW_PIN, HIGH);
+            digitalWrite(GREEN_PIN, LOW);
+            digitalWrite(BLUE_PIN, LOW);
+            digitalWrite(RED_PIN, LOW);
+            break;
+        case GREEN:
+            digitalWrite(YELLOW_PIN, LOW);
+            digitalWrite(GREEN_PIN, HIGH);
+            digitalWrite(BLUE_PIN, LOW);
+            digitalWrite(RED_PIN, LOW);
+            break;
+        case BLUE:
+            digitalWrite(YELLOW_PIN, LOW);
+            digitalWrite(GREEN_PIN, LOW);
+            digitalWrite(BLUE_PIN, HIGH);
+            digitalWrite(RED_PIN, LOW);
+            break;
+        case RED:
+            digitalWrite(YELLOW_PIN, LOW);
+            digitalWrite(GREEN_PIN, LOW);
+            digitalWrite(BLUE_PIN, LOW);
+            digitalWrite(RED_PIN, HIGH);
+            break;
+        default:
+            break;
+        }
+    }
+
+    return 0;
 }