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Introductory Programming In Java

Lab 2

Objectives

Write a few small Java programs which require to useconditional structures, operators and loops.

Exercise One

Write a program to print out the last digit of an integerseven times the value of an integer which the user enters.

For example, if a user enters the number '53', your programwill compute the number 7*53=371 and print out the last digitwhich is '1'.

(Note that you will need to use the modulo operator (%) in this program.)

Exercise Two

• An examiner using a grading scheme whereby the grade depends on the marks thus:

      0-50   F51-60  E61-70  D71-80  C81-90  B91-100 A

  Write a program that asks for a score (0-100) and reports the grade (F-A).

• Refine the previous program by making it to add a '+' or '-' after the grades E and above according to last digit as follows:

  1-3   -4-7    8-0   +

  This means that a mark of 93 is A-; 88 is B+; 65 is D and so on.

Exercise Three

• Write a program that asks the user for a positive integer n andprints out the n×n grid like this (when n is 4):

  +--+--+--+|  |  |  |+--+--+--+|  |  |  |+--+--+--+|  |  |  |+--+--+--+

  You should have one method to print the even rows and one method to print the odd rows.

• Write a similar program which prints out a triangle:

      +   /|  / | /  |+---+

Further programming ideas

Different functionalities of your programs (like calculating a desirednumber, or determining a grade, or printing a result etc), should be implemented with the help of different methods: this is calledmodularization — one of the basic principles of programming.If you did not use methods in our coding solutions, but lumped everythinginto one main method, then re-implement everything usingmodularization.

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