Thread: Converting from decimal to hexadecimal. Can't figure out how to output correctly

 
import java.util.Scanner;
 
public class FindHexString {
	public static void main(String[] args) {
 
String hexString = ""; //output a hex string
int decNumber;		//decimal number to be converted
int storeInput; 	//copy f input decimal number
int remainder;
 
Scanner in = new Scanner(System.in);
 
//read the decimal number to be converted
System.out.println("Please enter a positive integer: ");
decNumber = in.nextInt();
storeInput = decNumber;		//remember input for late print
 
//rejecting negative number input
while(decNumber < 0 ){
System.out.println("Enter only positive integers please!");
decNumber = in.nextInt();
storeInput = decNumber;
 
}
 
if(decNumber == 0 ){
System.out.println("Input decimal number is: " + storeInput);
System.out.println("Hexadecimal value is: 0");
return;
}
 
//conversion process
while(decNumber > 0){
remainder = decNumber % 16;
decNumber /= 16;
hexString = remainder + hexString;
}
 
if(decNumber = 10){              //this is the part I'm having trouble with
hexString = "A";
}
 
System.out.println("Input decimal number is " + storeInput);
System.out.println("Hexadecimal value = " + hexString);
 
	}
}

I am trying to figure out how to convert from decimal to hexadecimal without using the java library function. This is just a guess. I could be wrong.
Please and thank you for your help.

If you just want to print the hexadecimal value corresponding to the decimal then you can use print formats like..

System.out.printf("%X", integerValue);

.

In addition, note the bug at:

if(decNumber = 10){

You'd want to use the double-equals equality operator. (Summary of Operators (The Java™ Tutorials > Learning the Java Language > Language Basics))