The flow chart would go:
Start
Input C (Celsius)
IF C = -999 THEN END
Calculate F (Fahrenheit) using the formula
Output F
Goto next temperature (Input C)
The above needs tidying up and coding in the computer language you are using.
To convert temperatures from Celsius to Fahrenheit, use the formula F = 5 9 × C + 32 . The input continues until the user types -999 to stop. Each entered temperature is converted and outputted before returning to the input prompt.
;