Description: 3. Write a program to simulate the vending machine. Can pass to the vending machine into the COINS to buy goods. The user from the vending machine commodity list choose a commodity and put in a coin. If the amount is enough, then to provide corresponding commodities If the amount is not enough, or the goods have already been sold out, will return COINS. The vending machine maintenance staff to add commodities or take away sales amount. Using CRC card design classes and class of methods, at the same time given UML diagrams and implement the program
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