Copy your temperature.c file from your Lab3 directory into your Lab4 directory. Modify the program to compute the conversion from Fahrenheit to Celsius in a function called tocelsius(). The prototype for this function is:

float tocelsius(float fahrenheit);

/* Given: a temperature reading in degrees Fahrenheit

Returns: the temperature in degrees Celsius

*/

Modify the driver, main(), to prompt the user to enter a temperature in Fahrenheit, convert the value using the function and print the result. The driver should loop asking the user for input until a special data value is entered. Since 0 is a valid Fahrenheit temperature, we need something else. Physics tells us that no temperature can be lower than absolute zero (-273 degrees C, or -459 degrees F), let's use -500 as the special data value to terminate Fahrenheit input. Your file will be called temperature.c.

Here is the original file temperature.c file

#include int main() float fahrenheit; float celsius printf("Enter the temperature in fahrenheit: 'scanf("%f", &fahrenheit) /* Convert the temperature from fahrenheit to celsius */ celsius = (fahrenheit - 32) * 5/9 printf(" %.2f Fahrenheit = %.2f_Celsius ", fahrenheit, celsius) return of