When you want to determine whether a variable holds one of many valid values, one option is to use a do…while loop to compare the variable to a series of valid values.

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A better option would be to use a conditional statement, such as an if statement or a switch statement, to compare the variable to the valid values. A do…while loop is typically used when you need to repeatedly execute a block of code while a condition is true, but it doesn't make sense to use it to compare a variable to a fixed set of valid values.

When You Want to Determine Whether a Variable Holds One