How we use boolean expression in if condition for a alphabet and special character ?

Question

For example
I want to write a code that cheek a variable if it is even or odd and if the input variable isn't a number the I want output to be invalid. What should I do to make it right?

Answer 1

In general the numbers can be tested for even and odd with modulo 2 (x%2 == 0) division. For another things will be better to know in which language you want to code.

Answer 2

John ,

please modify your post by naming the programming language

Answer 3

next().charAt(0);

Answer 4

You can use an if-else statement, a switch statement or catching exceptions. The way you implement it syntactically is very dependent on the language though.