1 Project 5: Leap Years. 222 Leap Years Write a program that reads an integer value from the user representing a year and determines if the year is a.

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Presentation transcript:

1 Project 5: Leap Years

222 Leap Years Write a program that reads an integer value from the user representing a year and determines if the year is a leap year in the Gregorian calendar (the normal calendar that we use.) A year is a leap year if it is divisible by 4, unless it is also divisible by 100 but not by 400. Output an error message for any input value less than 1582 (the year the Gregorian calendar was adopted.) (This is Programming Project PP 5.1 in the textbook.)

333 Leap Years Test your program using the following data: 1400Error 1900Not leap year 2000Is a leap year 2003Not a leap year 2004A leap year 2100Not a leap year

444 General outline of your main function Declare your variables The only variable you will need is an int to hold the year. Get the input from the user. Check for the year being valid Greater than or equal to Determine if the year is a leap year, and output the result.

555 Sample Run Your output should be similar in format to that shown in the sample run shown on the next slide.

666 Error case

777 Writing the Program Start with a stub Just output the prompt: Enter a year greater than 1581 Compile and test after each step. Always have a working program! Add code to get the input. Instantiate a Scanner. Remember to import java.util.Scanner Declare an int variable for the input, year. Read the input, year. Output the year, so that you can verify that you read it correctly.

888 Writing the Program Check for the year being less than If it is, output an error message and terminate. If the year is greater than or equal to 1582, check if it is divisible by 4. If it is not, the year is not a leap year. Output the result and terminate. At this point you know that the year is valid and is divisible by 4. So it could be a leap year. Check if it is divisibe by 100. If not, it is a leap year. Output the result and terminate.

999 Writing the Program If you reach this step, the year is divisible by 100. Check if it is also divisible by 400. If it is, it is a leap year. Output the result and terminate. If you reach this point, the year is divisible by 100 but not by 400. That means that it is not a leap year. Output the result and terminate.

10 Implementation Hint You will need multiple levels of if... else At each step, add another "else" if (xxx) { } else { if (yyy) {... } else {... }

11 Submission Put your Java source file into a folder and zip it. Submit your zipped Java source file via Canvas Assignments. Project is due by 11:59 PM Sunday, February 14 Sections 001 and 002 Monday, February 15 Sections 003 and 004

12 Ground Rules It is OK to discuss the project with other students BUT Do not share your code with other students. Before or after submitting the project. Do not copy any other student’s code. Or even look at it. Do not let anyone copy or examine your code.

Ground Rules Except for code posted on the class web site Do not copy code from the Internet or any other source (other than the textbook.) Do not ask for help on an Internet forum. If you need help, ask your instructor or a TA. Come to lab and help sessions. Write your own code.