Question: Write a program in C language to calculate the serial number of the day in the year, based on the input year, month and day.

Write a program in C language to calculate the serial number of the day in the year, based on the input year, month and day. For example, when the input is 2021, 2, 21, the output should be 52, because Feb, 21st, 2021 is the 52nd day of the year. Hint: you may want to use the switch statement, and please do not forget about the leap year. (5 marks)

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