Hi Friend,

Try the following code:

import java.util.*;
class Temperature{
double temp;
char scale;
Temperature(double temp,char scale){
this.temp=temp;
this.scale=scale;
}
Temperature(char scale){
setTemp(0);
this.scale=scale;
}
Temperature(double temp){
this.temp=temp;
setScale('C');
}

public void setTemp(double temp){
temp=temp;
}
public void setScale(char scale){
scale=scale;
}
public double convertToCelsius(){
double c= (temp - 32) / 1.8;
return c;
}
public double convertToFahrenheit(){
double f=(temp*1.8+32);
return f;
}
public static void main(String[] args){
Scanner input=new Scanner(System.in);
System.out.print("Enter temperature: ");
double t=input.nextDouble();
System.out.print("Enter scale: ");
String s=input.next();
char ch=s.charAt(0);
if((ch=='C')&&(t!=0)){
Temperature t1=new Temperature(t,ch);
double tempF=t1.convertToFahrenheit();
System.out.println(tempF+"F");
}
else if((ch=='F')&&(t!=0)){
Temperature t2=new Temperature(t,ch);
double tempC=t2.convertToCelsius();
System.out.println(tempC+"C");
}
else if((ch!=' ')&&(t==0)){
Temperature t3=new Temperature(ch);
if(ch=='C'){
double tempF=t3.convertToFahrenheit();
System.out.println(tempF+"F");
}
else if(ch=='F'){
double tempC=t3.convertToCelsius();
System.out.println(tempC+"C");
}
}
else if((ch==' ')&&(t!=0)){
Temperature t4=new Temperature(t);
double tempF=t4.convertToFahrenheit();
System.out.println(tempF+"F");
}
}
}

Hope that it will be helpful for you.
Thanks