Close. It won't compile because you forgot to declare a variable
Why make a boolean when you can pass choice directly? Also, you need a couple \n here and there so that it displays better.
I mean:
<font color=lime>lopez@pc9-142</font> <font color=yellow>aks $></font> ./conv2
Choose your conversion:
1. To fahrenheit
2. To celcius1
Enter your temperature: 12
53.6<font color=lime>lopez@pc9-142</font> <font color=yellow>aks $></font> ./conv2
Choose your conversion:
1. To fahrenheit
2. To celcius2
Enter your temperature: 53.6
12<font color=lime>lopez@pc9-142</font> <font color=yellow>aks $></font>