GTU OOP Program - 15
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.
import java.util.Scanner;
class Program_15 {
public static int bin2Dec(String binString) throws NumberFormatException {
int decimal = 0;
int strLength = binString.length();
for (int i = 0; i < strLength; i++) {
if (binString.charAt(i) < '0' || binString.charAt(i) > '1') {
throw new NumberFormatException("Please Enter a Binary String");
}
decimal += (binString.charAt(i) - '0') * Math.pow(2, strLength - i - 1);
}
return decimal;
}
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter Binary String : ");
String str = input.nextLine();
try {
System.out.println("Value of binary to decimal is : " + bin2Dec(str));
} catch (NumberFormatException e) {
System.out.println(e);
}
}
}
Output
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