1.determine four ()'s (main(),odd() ,sub (),rod (.)
the main () allows the user to select arithmetic operation to be performed using the following....
if choice is equal to 1, the odd () will be executed, it allows the users to input two integers values compute and display the sum.
if choice is equal to 2, the sub () will be executed it allows the user to input two values, compute and display the difference.
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