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# Java: Displaying number in it's binary representation

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Write a Java program that uses bitwise operations to:

1. generate and display all power-of-two numbers in the range +128 to -128, and
2. display an arbitrary user-input integer.

Implement the solution using one class. In your class, provide two methods - main and display.

- Declare int number = 128;
- Include a while loop that loops while number is >= Â­-128.
+ Call the display method, which prints the value of its passed-in number parameter.
+ If number is greater than zero, use the >>= operator to do one arithmetic right shift.
+ If number equals zero, use the ~ operator to complement it.
+ If number is less than zero, use the <<= operator to do one left shift.
- After the while loop, ask the user to input any number, and call the display method to print that number.

- Print number's value and a tab.
- Assign to a local variable named mask the value 1 shifted left 31 times. This puts a 1 in bit 31 and zeros in all other bits.
- Use a for loop to step through all 32 bits, doing the following in each step:
+ Use a conditional operator whose condition is (mask & number != 0) to print either 1 or 0.
+ After every fourth bit, print a single space to make the output readable.

Your program should mimic the sample session given below.

Decimal Binary

128 0000 0000 0000 0000 0000 0000 1000 0000
64 0000 0000 0000 0000 0000 0000 0100 0000
32 0000 0000 0000 0000 0000 0000 0010 0000
16 0000 0000 0000 0000 0000 0000 0001 0000
8 0000 0000 0000 0000 0000 0000 0000 1000
4 0000 0000 0000 0000 0000 0000 0000 0100
2 0000 0000 0000 0000 0000 0000 0000 0010
1 0000 0000 0000 0000 0000 0000 0000 0001
0 0000 0000 0000 0000 0000 0000 0000 0000
-1 1111 1111 1111 1111 1111 1111 1111 1111
-2 1111 1111 1111 1111 1111 1111 1111 1110
-4 1111 1111 1111 1111 1111 1111 1111 1100
-8 1111 1111 1111 1111 1111 1111 1111 1000
-16 1111 1111 1111 1111 1111 1111 1111 0000
-32 1111 1111 1111 1111 1111 1111 1110 0000
-64 1111 1111 1111 1111 1111 1111 1100 0000
-128 1111 1111 1111 1111 1111 1111 1000 0000

Enter any integer: 127
127 0000 0000 0000 0000 0000 0000 0111 1111