Question

Create a program (java): that reads a 8-bit String input, must be read in as such. Then convert that string of 1s and 0s to decimal as if it were encoded using the following representations:

Unsigned

1's Complement

2's Complement

Q(4.4) (2's complement)

1 bit (sign) - 3 bits (exponent: use bias) - 4 bits (significand), implied binary point w/ 1. Also check for 0....

Do not use helper functions, must be done iterating string and modifying an int/long value.

Desired execution:

Enter a binary number: 10011010

Unsigned: 154
1's Comp: -101
2's Comp: -102
Q(4.4): -6.375
S-Exp-Sig: -0.40625

Answer 1

import java.util.*;
class Main{
public static long Power(int base,int exp){
long res=1;
for(int i=0;i<exp;i++){
res=res*base;
}
return res;
}
public static long Bin2Dec(String bin){
long dec=0,sum=0;
int n = bin.length(),j=0;
for(int i=n-1;i>=0;i--){
if(bin.charAt(i)=='0'){
dec=0;
}
else if(bin.charAt(i)=='1'){
dec=1*Power(2,j);
}
j++;
sum=sum+dec;
}
return sum;
}
  
public static long Unsigned(String bin){
bin='0'+bin;
long dec=0;
int n = bin.length();
for(int i=0;i<n;i++){
if(bin.charAt(i)=='0'){
bin.replace('0', '1');
}
else if(bin.charAt(i)=='1'){
bin.replace('1', '0');
}
}
dec=Bin2Dec(bin);
return dec;
}
  
public static long OnesComp(String bin){
long dec=0;
int n = bin.length();
String nwbin;
long sym=1;
StringBuilder builder = new StringBuilder(bin);
if (bin.charAt(0) == '0') {
sym=1;
}
else if (bin.charAt(0) == '1') {
sym=-1;
}
for (int i = 0; i < n; i++) {
if (bin.charAt(i) == '0') {
builder.setCharAt(i, '1');
}
else if (bin.charAt(i) == '1') {
builder.setCharAt(i, '0');
}
}
nwbin = builder.toString();
dec=Bin2Dec(nwbin);
dec=dec*sym;
return dec;
}
public static long TwosComp(String bin){
long dec;
if(OnesComp(bin)<0){
dec=OnesComp(bin)-1;
}
else{
dec=OnesComp(bin)+1;
}
return dec;
}
  
/*
public static long Sig_Exp(String bin){
long sym;
if (bin.charAt(i) == '0') {
sym=1;
}
else if (bin.charAt(i) == '1') {
sym=-1;
}
}
*/
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
System.out.print("Enter a Number : ");
String i=sc.nextLine();
System.out.println("Unsigned of "+i+" : "+Unsigned(i));
System.out.println("One's Complement of "+i+" : "+OnesComp(i));
System.out.println("Two's Complement of "+i+" : "+TwosComp(i));
}
}