CIS202 Exam 1 1. Convert from base 2 to base 10 (4 points)

Transcription

1 CIS202 Exam 1 1. Convert from base 2 to base 10 (4 points) Name: Convert the 57 from base 10 to base 2 (4 points) What are the values of the following expressions? (18 points) a. 27 / 5 5 b / c. 38 % 3 2 d * 3 35 e. Math.pow(10, 2) 100 f. (double) 27 / (double) g. true false true h. true && false false i. true true && false true

2 4. What is the output of the following program? (4 points) int y = 15; x += 3; y -= 12; System.out.println(x); System.out.println(y); What is the output of the following program? (4 points) int y = 15; x = x + y; System.out.println(x); System.out.println(y);

3 6. Assuming that the value of the String college is "Saint Rose", the value of the String major is "Mathematics",and the value of the string minor is "MATHEMATICS", what are the value of the following expressions? (16 points) a. college.length() 10 b. major.charat(2) t c. college.touppercase() SAINT ROSE d. major.equals(minor) false e. major.equalsignorecase(minor) true f. college.compareto(major) < 0 false g. college.compareto(minor) > 0 true h.! (major.comparetoignorecase(minor) == 0) false 7. What is the output of the following program? (4 points) if (x < 50) if (x < 500) System.out.println(""); A 3

4 8. What is the output of the following program? (4 points) if (x < 50) if (x < 5) System.out.println(""); System.out.println("C"); 9. What is the output of the following program? (4 points) switch (x) case 5: case 10: System.out.println(""); default: System.out.println("C"); 4

5 10. What is the output of the following program? (4 points) int x = 5; switch (x) case 5: case 10: System.out.println(""); default: System.out.println("C"); A C 11. What is the output of the following program? (4 points) import java.text.decimalformat; double x = ; double y =.4872; DecimalFormat formatter1 = new DecimalFormat("#,##0.0"); DecimalFormat formatter2 = new DecimalFormat("#.00"); System.out.println(formatter1.format(x)); System.out.println(formatter1.format(y)); System.out.println(formatter2.format(x)); System.out.println(formatter2.format(y)); 2,

6 12. Write a program that will create variables to store someone's income, home town, and gender (either M or F). The program should ask the user to enter their income, hometown and gender. Using a switch statement, print an appropriate message based on the gender. Print an error message if they input something other than M or F. Using an if- statement, print one message if the hometown is Albany and print a different message if the hometown is anything. Using an if--if statement, print one message if the income between and ; a different message if the income is between and 50000; and a third message if it s anything. (30 points) 6

7 import javax.swing.joptionpane; 2 double income; String hometown; char gender; String temporary; temporary = JOptionPane.showInputDialog("Income?"); income = Double.parseDouble(temporary); hometown = JOptionPane.showInputDialog("Hometown?"); temporary = JOptionPane.showInputDialog("Gender, M or F?"); gender = temporary.charat(0); switch(gender) case 'M': JOptionPane.showMessageDialog(null, "You are male"); case 'F': JOptionPane.showMessageDialog(null, "You are female"); default: JOptionPane.showMessageDialog(null, "Error on gender"); if (hometown.equals("albany")) JOptionPane.showMessageDialog(null, "You live in Albany"); JOptionPane.showMessageDialog(null, "You don't live in Albany"); if (income >= && income <= ) JOptionPane.showMessageDialog(null, "income K"); if (income >= && income < 50000) JOptionPane.showMessageDialog(null, "income 30-50K"); JOptionPane.showMessageDialog(null, "income high or low"); System.exit(0); 7