#include <SD.h>

#define FILE_PATH   "/test.txt"

float quarters = 0;

void setup() {
  Serial.begin(9600);
  if (!SD.begin(4)) {
    Serial.println("An Error has occurred while mounting SD");
    while(1);
  }
  Serial.println("SD seems ok.");
}


void writefile(float message) {

  SD.remove(FILE_PATH);                                 // Wokwi seems to need this.
  File file = SD.open(FILE_PATH, FILE_WRITE);
  if (!file) {
    Serial.println("Failed to open file for writing");
    return;
  }
  file.seek(0);                                         // If not a fresh file, you'd need this.
  file.write((uint8_t*)&message,sizeof(float));
  file.close();
}


float readfile(void) {

  float outQuarters;

  File file = SD.open(FILE_PATH, FILE_READ);
  if (!file) {
    Serial.println("Failed to open file for writing");
    return;
  }
  file.seek(0);
  file.read((uint8_t*)&outQuarters,sizeof(float));
  file.close();
  return outQuarters;
}


void loop() {
  
  quarters++;
  writefile(quarters);
  quarters = readfile();
  Serial.print("KYLE OWES: ");
  Serial.print(quarters,0);
  Serial.print(" quarters = $ ");
  Serial.println(quarters/4);
  delay(1000);
}