Create 4 functions:
morethat takes 1 argument and adds 1 to it.lessthat takes 1 argument and subtracts 1 from it.addthat takes 2 arguments and adds them together.subthat takes 2 arguments and subtracts the second argument from the first.
All the functions must return the result of the operations specified above.
Each function should be defined with the exact number of parameters needed.