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Unformatted text preview: In-Lab 1: Computer Programs (Exercise) Introduction:This exercise has two parts. In Part 1, you will experiment with instructions using DrJava’s special “Interaction” mode. These short examples are not programs themselves. They allow you to try things out before creating a real program. You will also be introduced to some important vocabulary terms covered in section 1.10 of the textbook. In Part 2, you will enter an actual program, similar to what you will do for Lab #1. Part 1:1. Start DrJava (the icon is a large “J” with a stethoscope). You should see the following screen: 2. Click next to the “>” prompt in the Interactionswindow near the bottom (located inside the dashed oval in the figure above). You should now have a blinking cursor there. 3. Java can calculate mathematical expressions. Type the following expression, and press the ENTER key where shown: 2+2<ENTER>You should see the result 4on the screen. 4. Java performs algebraic operations in the standard order (e.g. multiplication and division before addition and subtraction). Type the following expression, and press the ENTER key where shown: 1+2*3-4/2<ENTER>You should see the result 5on the screen. 5. In programming, a variableis similar to a variable in mathematics. Each one has a unique name and may be set to different values. Type the following instructions, and press the ENTER key where shown: a = 1;<ENTER>b = 2;<ENTER>c = 3;<ENTER>You will begin typing here. a+b*c...
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This note was uploaded on 04/10/2008 for the course ENGR 131 taught by Professor Xiaowei during the Spring '07 term at Case Western.
- Spring '07