CS110: Namita Singla
Sample Exam1
CS110 Introduction to Computing in Java
Spring 2005
Sample Exam 1
Namita Singla
Feb 15, 2005
Name:____________________________________________________
Question 1:
Given the following local variable declarations:
String s = “abc”;
String a = "Did Hannah see bees? Hannah did.”;
String t;
What is the value of the following expressions (or ERROR)?
1. __________ s.length()
2. __________ t.length()
3. __________ a.charAt(5)
4. __________ s.toUpperCase()
5. __________ s+1
6. __________ a.indexOf(‘H’)
7. __________"Tomorrow".lastIndexOf(‘o’)
8. __________"Tomorrow".substring(2,4)
9. __________ s.substring(1,3).equals("bc")
10. __________ (s.length() + s).startsWith("a")
Question 2
What is the value of variable a after executing each of the following?
a. boolean a = (2.5 == (double)(5 / 2));
b. boolean a = (3 == (1 + 2 * 11 % 4));
c. double a = 10/3;
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CS110: Namita Singla
Sample Exam1
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d. double a = (double)10/3;
e. boolean a = (2.5 == (double)5 / 2);
Question 3:
Complete the following class called MyClass. This class consists of a single main
method that asks the user to input an integer. The main method tells whether the
number is even or odd.
A sample output for your class would be:
Enter an integer: 12
12 is an even number
import java.util.Scanner;
public class MyClass {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter an integer: ");
int num = input.nextInt();
// your code goes here
}
}
CS110: Namita Singla
Sample Exam1
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Question 4:
public class MySwitch {
public static void main(String[] args) {
int k=10;
switch(k) {
case 10:
System.out.println("ten");
case 20:
System.out.println("twenty");
break;
default:
System.out.println("This is the default output");
break;
}
}
}
(a) What is the name of above class?
.
(b) List all the java reserved words in the above class.
(c) What will happen when you attempt to compile the above code? Will you get any
output? If yes then write the output.
Question 5: Given the following declarations, what is the value of each of the following
expressions? Write ERROR for any error that may occur.
int x = 4;
int y = 0;
int z = 3;
boolean flag = true;
a. ((x > z) || flag)
b. “Value:”+ x + x/2
CS110: Namita Singla
Sample Exam1
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c. “Value:”+ (z + z/2)
d. (y == 0) || (2/y == 0)
e. !flag || (2/y == 0)
Question 6:
a. Give an example of a relational operator. ______________
b. Give an example of a primitive date type. ___________________
c. Give an example of a logical operator.___________________
d. Give an example of Conditional statement. ______________
e. Name any class from Java class library.___________________
f. Which java reserved word is used to declare constant variables? ___________
g. What is a compiler?
h. Every compiled program in java must have a main method? TRUE/ FALSE
i. Why java is called a fully object oriented language?