Help me make a Binary Arithmetic Calculator with Turbo C.

I need help in making a C program that performs binary operations on two 16 bit binary values. It should look like this:

Select operation

(1) Addition

(2)Subtraction

Enter Choice: 1

Enter First binary number: 1111111111111110

Enter Second binary number: 0000000000000001

Sum: 1111111111111111

I have trouble using the functions, please help.

I think this page should get you on your way: http://www.daniweb.com/software-development/c/code/216372