Write an algorithm to check whether a given number is even or odd.

Algorithm to check if a number is even or odd:

1. Start
2. Input a number N
3. If N mod 2 = 0 (i.e., N is divisible by 2 with no remainder), then
   • Print “The number is even.”
4. Else
   • Print “The number is odd.”
5. End

This algorithm first checks if the number is divisible by 2. If it is, the number is even; otherwise, it is odd.