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**Multi-Function Calculator - Ask the user for 2 numbers, then ask them to select from a numbered list of operations. As rudimentry error checking, give them an extra chance if they enter an invalid value. Depending on the operator selected (+, -, *, and /) do the operation on the numbers and print out the result including the equation with the proper operator. Remember to check for situations such as division by zero. You'll have to use floating-point numbers here as well. **