Spark Core Float to Byte Test

SparkFloatToByteTest.ino

float a =  6.7;
float b = 14.6;
float c = 26.3;

byte* method1(float num)
{
  byte buff[sizeof(float)];
  memcpy(buff, &num, sizeof(float));

  return buff;
}


byte* method2(float num)
{
  union float2bytes { float f; unsigned char b[sizeof(float)]; };
  float2bytes f2b;
  f2b.f = num;

  return f2b.b;
}

void setup() {
  
  Serial.begin(57600);
  
  while(!Serial.available()) SPARK_WLAN_Loop();
}

void loop() {

  Serial.println("Start --------------");
  Serial.println();
  
  Serial.println("Method 1");
  Serial.print("a = ");
  Serial.write(method1(a), 4);
  Serial.println();
  Serial.print("b = ");
  Serial.write(method1(b), 4);
  Serial.println();
  Serial.print("c = ");
  Serial.write(method1(c), 4);
  Serial.println();
  Serial.println();

  Serial.println("Method 2");
  Serial.print("a = ");
  Serial.write(method2(a), 4);
  Serial.println();
  Serial.print("b = ");
  Serial.write(method2(b), 4);
  Serial.println();
  Serial.print("c = ");
  Serial.write(method2(c), 4);
  Serial.println();
  Serial.println();
  
  Serial.println("End  ----------------");
  
  // Endless loop (but keep wifi alive)
  while(1) SPARK_WLAN_Loop();
}

UnoFloatToByteTest.ino

/* Arduino UNO Sketch */
float a =  6.7;
float b = 14.6;
float c = 26.3;

byte* method1(float num)
{
  byte buff[sizeof(float)];
  memcpy(buff, &num, sizeof(float));

  return buff;
}


byte* method2(float num)
{
  union float2bytes { float f; unsigned char b[sizeof(float)]; };
  float2bytes f2b;
  f2b.f = num;

  return f2b.b;
}

void setup() {
  
  Serial.begin(57600);
  
  while(!Serial.available());
}

void loop() {

  Serial.println("Start --------------");
  Serial.println();
  
  Serial.println("Method 1");
  Serial.print("a = ");
  Serial.write(method1(a), 4);
  Serial.println();
  Serial.print("b = ");
  Serial.write(method1(b), 4);
  Serial.println();
  Serial.print("c = ");
  Serial.write(method1(c), 4);
  Serial.println();
  Serial.println();

  Serial.println("Method 2");
  Serial.print("a = ");
  Serial.write(method2(a), 4);
  Serial.println();
  Serial.print("b = ");
  Serial.write(method2(b), 4);
  Serial.println();
  Serial.print("c = ");
  Serial.write(method2(c), 4);
  Serial.println();
  Serial.println();
  
  Serial.println("End  ----------------");
  
  // Endless loop
  while(1);
}