Data Expressions(1)

# Data Expressions(1) - Data Expressions(1) Java Programming...

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Data Expressions(1) Java Programming Lab Exercises Topics Lab Exercises Variables Prelab Exercises Constants Area and Circumference of a Circle Assignment Painting a Room Submitting your assignment in WebCT Vista Your task is to submit your assignment under the supervision of your instructor: o Upload this file (DataExpressions(1).rtf) with your answers to the assignment box in WebCT for this lab class. o Upload your programs (Errors.java, Circle.java, Circle2.java, Circle3.java, and Paint.java) to the assignment box in WebCT for this lab class. Data Expressions(1) 1

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Prelab Exercises 1. What is the difference between a variable and a constant? 2. Explain what each of the lines below does. Be sure to indicate how each is different from the others. a. int x; b. int x = 3; c. x = 3; 3. The following program reads three integers and prints the average. Fill in the blanks so that it will work correctly. // ******************************************************************* // Average.java // // Read three integers from the user and print their average // ******************************************************************* import java.util.Scanner; public class Average { public static void main(String[] args) { int val1, val2, val3; double average; Scanner scan = new Scanner(System.in) ; // get three values from user System.out.println("Please enter three integers and " + "I will compute their average"); ____________________________________ ____________________________________ ____________________________________ //compute the average ____________________________________ //print the average ____________________________________ } } 2 Data Expressions(1)
4. Given the declarations below, find the result of each expression. int a = 3, b = 10, c = 7; double w = 12.9, y = 3.2; a. a + b * c b. a - b - c c. a / b d. b / a e. a - b / c f. w / y g. y / w h. a + w / b i. a % b / y j. b % a k. w % y 5. Carefully study the following program and find and correct all of the syntax errors. // File: Errors.java // Purpose: A program with lots of syntax errors // Correct all of the errors (STUDY the program carefully!!) #import java.util.Scanner; public class errors { public static void main (String[] args) { String Name; / Name of the user int number; int numSq; Scanner scan = new Scanner(System.in); System.out.print ("Enter your name, please: ") Name = scan.nextInt(); System.out.print ("What is your favorite number?); number = scan.nextInt(); numSq = number * number; System.out.println (Name ", the square of your number is " numSquared); } Data Expressions(1) 3

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6. Trace the execution of the following program assuming the input stream contains the numbers 10, 3, and 14.3. Use a
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## This note was uploaded on 03/31/2010 for the course CPSC 1301 taught by Professor Khan,s during the Spring '08 term at Columbus State University.

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Data Expressions(1) - Data Expressions(1) Java Programming...

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