86. FLOATING POINT ADDER IN JAVA

import java.io.*;

import java.util.*;

class FloatingPointAdder

{          int exp;

            Scanner s=new Scanner(System.in);

            float n1,n2;

            String temp1="",temp2="";

            int exp1,exp2;

            String tmp1="",tmp2="";

            char cry='0';    

            char s1='0',s2='0';

            String e1,e2;

            String m1="", m2="";

            int cmn_expo;

            void input()

            {

                        System.out.println("enter 1st no");

                        n1=s.nextFloat();

                        temp1=tobin_Int((int)n1)+"."+tobin_Float(n1-(int)n1);

                        System.out.println(temp1);

                        System.out.println("enter 2nd no");

                        n2=s.nextFloat();

                        temp2=tobin_Int((int)n2)+"."+tobin_Float(n2-(int)n2);

                        System.out.println(temp2);

                        ieeeformat();

            }

            String tobin_Int(int n)

            {

                        String str="";

                        char c[]=new char[100];

                        int i=-1;

                        while(n!=0)

                        {

                                    c[++i]=(char)(n%2);

                                    n=n/2;

                        }

                        for(;i>=0;i--)

                        str+=c[i]-0;

                        return str;

            }

            String tobin_Float(float n)

            {

                        String str="";

                        for(int i=0;i<5 && n!=0;i++)

                        {

                                    n=n*2;

                                    str+=(int)n;

                                    if(n>=1)

                                                n=n-1;

                        }

                        return str;

            }

            void ieeeformat()

                        {

                        if(n1<0)

                                    s1='1';

                        if(n2<0)

                                    s2='1';

                        exp1=temp1.indexOf('.')-1;

                        exp=temp2.indexOf('.')-1;

                        e1=tobin_Int(exp1+127);

                        e2=tobin_Int(exp1+127);

                        for(int i=1;i<temp1.length();i++)

                                    if(temp1.charAt(i)!='.')

                                                m1+=temp1.charAt(i);

                        for(int i=1;i<temp1.length();i++)

                                    if(temp1.charAt(i)!='.')

                                                m2+=temp2.charAt(i);

                        System.out.println("\n IEEE FORMAT\n SIGNEXPONENT MANTISSA");

                        System.out.println(s1+""+e1+""+m1);

                        System.out.println(s2+""+e2+""+m2+"\n");

                        addition();

            }

            void addition()

            {

                        if(exp1>exp2)

                        {

                                    cmn_expo=exp1;

                                    for(int i=0;i<(exp2-exp1);i++)

                                                temp2+='0';

                        }

                        if(exp1<exp2)

                        {

                                    cmn_expo=exp2;

                                    for(int i=0;i<(exp2-exp1);i++)

                                                tmp1+='0';

                        }

                        if(exp1==exp2)

                                    cmn_expo=exp1;

                        tmp1+='1'+m1;

                        tmp2+='1'+m2;

                        addzeros();

                        char a,b;

                        String res="";

                                    for(int i=tmp1.length()-1;i>=0;i--)

                                                {

                                                            a=tmp1.charAt(i);

                                                            b=tmp2.charAt(i);

                                    if (cry=='0')

                                    {

                                    if(a=='0'&&b=='0')

                                    {

                                                cry='0';

                                                res+='0';

                                    }

                                    if((a=='0'&&b=='1')||(a=='1'&&b=='0'))

                                                {

                                                cry='0';

                                                res+='1';

                                                }

                                    if(a=='1'&&b=='1')

                                    {

                                                cry='1';

                                                res+='0';

                                    }

                        }

                        else

                        {

                                    if(a=='0'&&b=='0')

                                    {

                                    cry='0';

                                    res+='1';

                                    }

                        if((a=='0'&&b=='1')||(a=='1'&&b=='0'))

                        {

                                    cry='1';

                                    res+='0';

                        }

                        if(a=='1'&&b=='1')

                        {

                                    cry='1';

                                    res+='1';

                        }

            }

}

            if(cry =='1')

                        res+=cry;

                        int len=res.length();

                        char restmp[]=new char[len];

                        restmp=res.toCharArray();

                        res="";

            for(int i=len-1;i>=0;i--)

                        res+=restmp[i];

                        int i=cmn_expo+((int)cry-48);

                        res=res.substring(0,i+1)+'.'+res.substring(i+1);

                        System.out.println(res);

                        todec(res);

            }

            void addzeros()

            {

            int t1=tmp1.length(),t2=tmp2.length();

                        if(t1>t2)

                                    for(int i=0;i<(t1-t2);i++)

                                                tmp2+='0';

                        if(t1<t2)

                                    for(int i=0;i<(t2-t1);i++)

                                                tmp1+='0';

            }

            void todec(String str)

                        {

                        int i=str.indexOf('.');

                        float ans=0;

                        for(int j=0;j<str.length();j++)

                                    if(str.charAt(j)!='.')

                                    ans+=((int)str.charAt(j)-48)*Math.pow(2,--i);

                                    System.out.println(ans);

                        }

            }

            class FloatingAdder

                        {

                        public static void main(String str[])

                                    {

                                    FloatingPointAdder a=new FloatingPointAdder();

                                    a.input();

                                    }

                        }

/*OUTPUT:

enter 1st no

456

111001000.

enter 2nd no

258

100000010.

IEEE FORMAT

SIGN EXPONENT MANTISSA

01000011111001000

01000011100000010

1011001010.

714.0

*/