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I've just completed an exercise from a book wherein the task is to display a menu of choices each associated to an alphabetical character. The program is to reject invalid characters and only finishing when a valid choice is made. Below is my solution, it achieves the task but I'd … 
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[code]how to validate alphabet character input? for example, i have these choices: a, b, c, d,,, the program will run but erratic. for example you've entered "d3" , how to solve this problem?[/code] 
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