ITEC 120 2009spring ibarland nokie jmdymacek

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lect01b
Anatomy of Hello-World

• Discuss the course-info—ITEC120: Principles of Computer Science I (w/ particularly attention to the honor policy).
• Review the result from last lecture: translating the “arithmetic program” h(t)=400-190-80-t into the corresponding Java code.
• Syntax of method call: memorize it!
  • In words: “To call a method: object-dot-methodName-openParen-arguments.”
  • Official syntax:
    method-call ::= object .name_method( expression, expression, … )

  We've seen examples that return answers: Math.sqrt( 12+4 )
  as well as examples which change some pixels on the screen, but don't return answers: System.out.println( 12+4 );
  We can use the answer from one method as the argument to another (!): Math.sqrt( Math.sqrt( 12+4 ) )
  System.out.println( Math.sqrt(12+4) );
  Note that it does not make sense to write Math.sqrt( System.out.println( 12+4 ) );. Why not? (We'll talk more about this later.)

• Use good spacing, indentation.

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©2009, Ian Barland, Radford University Last modified 2009.Jan.23 (Fri)

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