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3.4 detecting ranges using branches

Decision sequences are commonly used in programming to detect ranges of values. One way to do this is using an if-elseif structure, where each decision is evaluated in order, and the first true decision is executed. For example, a program could use a decision sequence to determine the insurance price based on a user's age. If the user is 15 or under, the insurance price is 0. If the user is between 16 and 24, the insurance price is 4800. If the user is between 25 and 39, the insurance price is 2350. And if the user is 40 or older, the insurance price is 2100. Decision sequences can also be used to detect increasing ranges. For example, a program could use a decision sequence to determine the value of x based on the number of sales. If the number of sales is less than 10, x is equal to 2. If the number of sales is less than 20, x is equal to 3. If the number of sales is less than 30, x is equal to 4. And if the number of sales is 30 or greater, x is equal to 4.