Have an array that can store up to 5 of your favorite radio stations.

Valid values are 87.5 to 108 MHz.

Ask the person if they want to enter in a radio station.
    If they say yes, ask them for the station frequency.
        If the frequency is valid, store it.
        If it's not valid, ask them again until they enter a valid value.
Repeat until the stations are all filled, or they decide to not enter another station.

After they are finished, display all the frequencies with the label of MHz after. Such as:

100.3 MHz