IT 401 Assignment 2 | Complete Solution

Question One
Identify and correct the error(s) in each of the following:  
1. double X = 12.5;
    int Y =X+4;

2. if (x = 1)
       y++;
  else if (x = 2)
     y = y + 2;
3. final double QUARTER_VALUE = 0.25;
      QUARTER_VALUE = 0.30;

Question Two
2.1Given the code:
 
what is the output in each of the following cases?
1. x=5 , y=2 , z=2   
2. x=2 , y=0 , z=0  
3. x=-1 , y=0 , z=0  
2.2 what is the output of the following code :
 
Question Three
Write complete Java programs, provide a screen snapshot
showing your program in execution to receive full credit.

Write a program that reads a Celsius degree in double from the console, then converts it to Fahrenheit and displays the result.

The formula for the conversion is as follows:

𝐹𝑎ℎ𝑟𝑒𝑛ℎ𝑒𝑖𝑡=(9÷5 )×𝐶𝑒𝑙𝑠𝑖𝑢𝑠+ 32

Typical run of the program:

Enter a Celsius degree: 35.5
35.5 degree Celsius is about 67.5 Fahrenheit.

    
Question Four
Write the following mathematical expressions in Java.  

Question Five
Consider the code:

String s;
Scanner in = new Scanner(System.in);
System.out.print("Enter a word: ");
s = in.next();

5.1 write one statement to  test if the user enters the string "Hello".

5.2 assume s = "I love KSA " ;
What is the output the following code ?

String S1= s.substring(4,10);
System.out.println(S1);