(15) Write the bin2Dec (string binary String) method to convert a binary string into a decimal number. Implement the bin2Dec method to throw a NumberFormatException if the string is not a binary string.
Program Code:
public class OOP_15
{
public static int bin2Dec(String binaryString) throws NumberFormatException
{
int decimal = 0;
int strLength=binaryString.length();
for (int i = 0; i < strLength; i++)
{
if (binaryString.charAt(i) < '0' || binaryString.charAt(i) > '1')
{
throw new NumberFormatException("The Input String is not Binary");
}
decimal += (binaryString.charAt(i)-'0') * Math.pow(2, strLength-1-i);
}
return decimal;
}
public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
System.out.print("Enter Binary Value : ");
String str = input.nextLine();
try
{
System.out.println("Decimal Value = " + bin2Dec(str));
}
catch(NumberFormatException e)
{
System.out.println(e);
}
}
}
Output:
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