Integer Wrapper Class

# Convert hexadecimal number to decimal number example

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#### 1 Comment

• mahesh says:

to convert hexadecimal to decimal without using any built in functions

import java.util.Scanner;

?

?

public class hex {

static long dec=0;

static long squ(int i)

{

long pow=16;

if(i==0)

{

System.out.println(“return value********”+1);

return 1;

}

else if(i==1)

{

System.out.println(“return value******”+16);

return pow;

}

else

{

for(int k=2;k<=i;k++)

{

pow=pow*16;

}

System.out.println(“return value********”+pow);

return pow;

}

}

public static void main(String[] args) {

Scanner so=new Scanner(System.in);

System.out.println(“enter the hexa decimal no”);

String hx=so.next();

hx.toLowerCase();

char c[]=hx.toCharArray();

int j=c.length;

int x=j;

int i=0;

/*System.out.println(j);

for(int k=0;k<j;k++) {=”” system.out.println(c[k]);=”” }*=”” j–;=”” while(j=””>=0)

{

if(c[j]==’a’|c[j]==’b’|c[j]==’c’|c[j]==’d’|c[j]==’e’|c[j]==’f’|c[j]==’1’|c[j]==’2’|c[j]==’3’|c[j]==’4’|c[j]==’5’|c[j]==’6’|c[j]==’7’|c[j]==’8’|c[j]==’9′)

{

j–;

}

else

{

i++;

break;

}

}

if(i>0)

{

System.out.println(“its not hex decimal no”);

}

else

{

System.out.println(“it s hex decimal no”);

x–;

int xy=0;

while(x>=0)

{

long z=squ(xy);

++xy;

char r=c[x];

String s=””+r;

System.out.println(“current char****”+s);

switch(s)

{

case “a”: dec=dec+(10*z);

break;

case “b”: dec=dec+(11*z);

break;

case “c”: dec=dec+(12*z);

break;

case “d”: dec=dec+(13*z);

break;

case “e”: dec=dec+(14*z);

break;

case “f”: dec=dec+(15*z);

break;

case “1”: dec=dec+(1*z);

break;

case “2”: dec=dec+(2*z);

break;

case “3”: dec=dec+(3*z);

break;

case “4”: dec=dec+(4*z);

break;

case “5”: dec=dec+(5*z);

break;

case “6”: dec=dec+(6*z);

break;

case “7”: dec=dec+(7*z);

break;

case “8”: dec=dec+(8*z);

break;

case “9”: dec=dec+(9*z);

break;

case “0”: dec=dec+(0*z);

break;

default:System.out.println(“cant find****”+s);

break;

}

System.out.println(“cur dec value—–“+dec);

System.out.println(“**************************”);

x–;

}

System.out.println(“decimal equ is*****”+dec);

}

/*String hx=so.next();

long i=Long.parseLong(hx);

//double i=Double.POSITIVE_INFINITY;

System.out.println(i);

}

*/

}

}