Java: Problem displaying 0's in binary

[dchips13]

Good day sirs.

I am creating a program to convert between decimal, binary and hexadecimal, and it works fine.

The problem is that I need binary outputs to display eight digits.

For example:
Decimal input of 5 yields "101" in binary but I need the output to show "00000101".

If it helps, I've been using Integer.toBinaryString(int), Integer.toHexString(int) to display output values.

Thanks in advance.

[Creatures]

one way would be checking the length of the binary string and if the size is smaller than (in your example) 8 just add the remaining zeros so you get a string with 8 chars

i could give it a try...

Creatures

[Creatures]

ah well that was a quick one ;p

}
	int x = 5;
	String str = Integer.toBinaryString(x); //int to bin string
	for(int q = 9;q >= str.length();q--) {  
		str = "0" + str;           //adding 0's until string.length() = 8
	}
	System.out.println(str);
}

you can use while, for, do while, whatever you prefer ;p

Creatures

[dchips13]

There are still problems in the number of 0's being appended.

Here are sample outputs:

4 = 0000100 (7 digits)
8 = 0001000 (7 digits)
16 = 00010000 (8 digits which is ok)
32 = 00100000 (ok again with 8 digits)
64= 001000000 (9 digits)
128 = 010000000 (9 digits)
255 = 011111111 (9 digits)

[dchips13]

Oh I got it to work by changing the for loop a bit:

int x = 5;
String str=Integer.toBinaryString(x);
for(int q=str.length();q<8;q++ ) {
str = "0" + str;
}
System.out.println(str);

[Rootstonian]

Glad you got...another method would have been to set an 8-byte array to all zeroes.
Then loop through storing remainder till number to convert is 0; then display array; display it backwards though (e.g. 128 bit value to 1 bit value). In C++:

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    
    int array[8] = {0,0,0,0,0,0,0,0};
    int i=0;
    int y;
    cout << "Enter number to convert (0 to 255): " ;
    cin >> y;
    while(y != 0) {
                array[i] = y % 2;
                i=i+1;
                y=y/2;
    }
    for(int i=7;i>=0;i--)
      cout << array[i];
    cout << endl;
    system("PAUSE");
    return EXIT_SUCCESS;
}