Code:
double fahrenheit(double inpF)
{
        {
	   double inpF
1) You're missing a ; at the end of the last line.
2) You've got a redefinition of the same variable. The variable in the function prototype has the same name as the one you're declaring.
3) While not wrong, you have an unneeded extra { pair in this function.

The same thing applies for your celcius function.

Quzah.