tft.drawFloat confusion

Projects Programming
1

Hi

I am using the following.

1.TFT library by Bodmer

2.Arduino 1.8.5

I am not sure what causes the problem ,

The library (dont think so)

Arduino 1.8.5 version (not sure)

Me (most likely)

1234 prints to the tft screen.(use tft.drawNumber)

1.234 also prints to the screen.(use tft.drawFloat)

5/1000 prints zero's...-0.000

void loop()
{
int Analog_0 = 0;  
float Value1 = 0;
float Value2 = 0;
float Value3 = 0;
  
Analog_0 = analogRead(A0);
tft.drawNumber(Analog_0,0,0,2);//Print 1023 on screen...work ok

Value1 = 1.234;                
tft.drawFloat(Value1,3,0,20,2);//Print 1.234 on screen...work ok

Value2 = (50/10);
tft.drawFloat(Value2,3,0,40,2);// Print 5.000...ok

Value2 = Value2/10;
tft.drawFloat(Value2,3,0,60,2);//Print 0.500...ok

Value2 = Value2/10;
tft.drawFloat(Value2,3,0,80,2);// print0.050...ok

Value2 = Value2/10;
tft.drawFloat(Value2,3,0,100,2);// Print 0.005...ok

Value3 = (50/1000);
tft.drawFloat(Value3,3,60,0,2);//Prints -0.000 ...Wrong!!!!!

delay(1000);
 
}

Please help ,what am I doing wrong?

2

Hello! Please copy the output of what happens in your black colored bow on the bottom of the Arduino Screen after the program is run and paste it here.

3

5/1000 uses integer arithmetic, even if you are storing the result in a float. The compiler doesn't look ahead. It evaluates 5/1000 (equals 0 in integer math) and then it looks at the type of the variable on the left of the assignment operator.

Try...

Value2 = (float)5 / 1000;

Or...

Value2 = 5.0 / 1000;