I removed the getch and clrscr functions as they are nonstandard and prevent compilation. Notice how no matter what my choice is and the temperature entered, the result is the same?

<font color=lime>lopez@pc9-142</font> <font color=yellow>aks $></font> ./conv3
What do you want to start with, enter your number than print enter.
0. Fahrenheit
1. Celsius
0
Input your fahrenheit vaulue and press
ENTER.
10
Fahrenheit value is: 32
Celsius value is: 0<font color=lime>lopez@pc9-142</font> <font color=yellow>aks $></font> ./conv3
What do you want to start with, enter your number than print enter.
0. Fahrenheit
1. Celsius
1
Input your fahrenheit vaulue and press
ENTER.
10
Fahrenheit value is: 32
Celsius value is: 0<font color=lime>lopez@pc9-142</font> <font color=yellow>aks $></font>