#include <stdio.h>
#include "pico/stdlib.h"


const int PUSH_BUTTON = 16;
const int RED_LED = 15;
int previous_button_position =0;
int Push_button=0;
int LED_STATE = 1;

void status()
{
Push_button = gpio_get(PUSH_BUTTON);
    if (Push_button != previous_button_position ) 
    {
      previous_button_position = Push_button;
      if (Push_button == 0) 
      {
        LED_STATE = LED_STATE ^ 1;//XOR operation
        
      }
    }
}

int main() {


gpio_init(RED_LED);
gpio_init(PUSH_BUTTON);

gpio_set_dir(PUSH_BUTTON, GPIO_IN);
gpio_set_dir(RED_LED, GPIO_OUT);
  
  while (true) 
  {
    
    if(LED_STATE==1)
    {
      gpio_put(RED_LED, 1);
      
        sleep_ms(250);
        status();
    
      gpio_put(RED_LED, 0);
      
        sleep_ms(250);
        status();
    
    }
   
     gpio_put(RED_LED, 0);
     status();
   
}
}