algo.java

package Trabajo;

public class DecimalAOctal {
	public static void main(String[] args) {
		octalADecimal("765");
	}
	public static void octalADecimal(String base) {
		String cadenaInver = "";
		int b = 0;
		int c = 0;
		for (int i = base.length()-1; i >= 0; i--) {
			cadenaInver += ""+base.charAt(i);
		}

		for (int i = 0; i <= cadenaInver.length(); i++) {
				String convertir = "" + cadenaInver.charAt(i);
				b = Integer.parseInt(convertir);
				c += (b * Math.pow(8, i));
			
		}
		System.out.println(c);
	}

}