Need help with my code basic

[johnwasser]

@GolamMostafa

Serial.print((int)5.0 * val * 100 / 1024); //please see note at bottom regarding this formula.
int temp = (int)(5.0 * val * 100 / 1024);

I would recommend:

// Temperature is volts * 100
const float Vref = 5.0;
int tempC = ((val * Vref) / 1024.0) * 100.0;
Serial.print(tempC);