Long Equation

I used float in declaring the value and used double in the equation

DEWTEMP0 = (237.3 * ( (log10 (double(RH0 / 100))) + ((7.5 * TEMP0) / (237.3 + TEMP0)))) / (7.5 - ( (log10 (double (RH0 / 100))) + ((7.5 * TEMP0) / (273.3 + TEMP0))));