Question

1. Declare the following variables: byteNumber, shortNumber, intNumber,

longNumber, floatNumber, doubleNumber choosing the types as suggested by the

identifiers.

For each of the following problems 2 through 4, (A) assign all the variables (given

in problem 1) their value according to the instructions given in problems 3 through 5.

Example:             byteNumber = 127;

shortNumber = 127;

….

doubleNumber = 127;

Then, display them in the console. (This two statements can be re-used throughout.)

Example:

String output = "\n\tbyteNumber = " + byteNumber +

"\n\tshortNumber = " + shortNumber +

"\n\tintNumber = " + intNumber +

"\n\tlongNumber = " + longNumber +

"\n\tfloatNumber = " + floatNumber +

"\n\tdoubleNumber = " + doubleNumber;

System.out.println("For problem 2(A): " + output);

Then, again, for each of these problems 2 through 4, (B) assign all variables (given in

problem 1) their value by means of reading input from the keyboard, using Scanner

class and its method (pp. 84-87).

Example:

Scanner keyboardInput = new Scanner(System.in)

System.out.println(“Enter the same integer number 127 six times: “);

byteNumber = keyboardInput.nextByte();

shortNumber = keyboardInput.nextShort();

…

doubleNumber = keyboard_Input.nextDouble();

Then display again the input read from the keyboard.

String output = "\n\tbyteNumber = " + byteNumber +

"\n\tshortNumber = " + shortNumber +

"\n\tintNumber = " + intNumber +

"\n\tlongNumber = " + longNumber +

"\n\tfloatNumber = " + floatNumber +

"\n\tdoubleNumber = " + doubleNumber;

System.out.println("For problem 2(B): " + output);

Do you get any error message? If a statement has an error, correct it, otherwise use

insert // in front of the statement. For example

//intByte = 127;

As a matter of fact, there is a correct statement. Use proper cast operator, it works.

intByte = (byte)127; //This works.

Report your explanation in a comment after the assignments. Observe their

differences (A) and (B) if there are.

*For the most part I assume that its pretty cop and paste but all of my java code has errors*

Answer 1

import java.util.Scanner;

public class variableTypes {
public static void main(String argv[])
{
//1
//declaring and initilizing variables
byte byteNumber=127;
short shortNumber=127;
int intNumber=127;
long longNumber=127;
float floatNumber=127;
double doubleNumber=127;
String output = "\n\tbyteNumber = " + byteNumber +

"\n\tshortNumber = " + shortNumber +

"\n\tintNumber = " + intNumber +

"\n\tlongNumber = " + longNumber +

"\n\tfloatNumber = " + floatNumber +

"\n\tdoubleNumber = " + doubleNumber;

System.out.println("For problem 2(A): " + output);

//2
//all errors are fixed

Scanner keyboardInput = new Scanner(System.in);//include Scanner module
System.out.println("Enter the same integer number 127 six times: ");
byteNumber = keyboardInput.nextByte();

shortNumber = keyboardInput.nextShort();
intNumber = keyboardInput.nextInt();
longNumber = keyboardInput.nextLong();
floatNumber = keyboardInput.nextFloat();
doubleNumber = keyboardInput.nextDouble();
output = "\n\tbyteNumber = " + byteNumber +

"\n\tshortNumber = " + shortNumber +

"\n\tintNumber = " + intNumber +

"\n\tlongNumber = " + longNumber +

"\n\tfloatNumber = " + floatNumber +

"\n\tdoubleNumber = " + doubleNumber;

System.out.println("For problem 2(A): " + output);
}
}

output:

run:
For problem 2(A):
   byteNumber = 127
   shortNumber = 127
   intNumber = 127
   longNumber = 127
   floatNumber = 127.0
   doubleNumber = 127.0
Enter the same integer number 127 six times:
127 127 127 127 127 127
For problem 2(A):
   byteNumber = 127
   shortNumber = 127
   intNumber = 127
   longNumber = 127
   floatNumber = 127.0
   doubleNumber = 127.0
BUILD SUCCESSFUL (total time: 10 seconds)