Octal to Decimal

sathishmepco · sathishmepco · commit 3907cea8d81e · 2020-12-13T00:06:00.000+05:30
diff --git a/InterviewPrograms/src/com/java/convertor/OctalToDecimal.java b/InterviewPrograms/src/com/java/convertor/OctalToDecimal.java
@@ -20,12 +20,59 @@
  * the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. 
  * It also requires a dot (decimal point) to 
  * represent decimal fractions.
+ * 
+ * Steps
+ * ------
+ * - get input (hexadecimal) from the user
+ * - create a variable, lets say pow (default value is 0)
+ * - create a variable, lets say decimal (default value is 0)
+ * - get the last digit of the octal number (last_digit = num%10)
+ * - multiply the last digit with power of 8 to pow variable
+ * - add the above result with decimal variable
+ * - increment the pow variable
+ * - continue all the above steps for all the digits of octal
+ * 
+ * say the octal is = 123
+ * decimal = 1 * 8^2 + 2 * 8^1 + 3 * 8^0
+ * decimal = 1 * 64 + 2 * 8 + 3 * 1
+ * decimal = 64 + 16 + 3
+ * decimal = 83
+ * 
+ * say the octal is = 144
+ * decimal = 1 * 8^2 + 4 * 8^1 + 4 * 8^0
+ * decimal = 1 * 64 + 4 * 8 + 4 * 1
+ * decimal = 64 + 32 + 4
+ * decimal = 100
+ * 
  */
+
 public class OctalToDecimal {
 	public static void main(String[] args) {
+//		int octal = 123;
+//		int octal = 144;
+		int octal = 1000;
+		System.out.println("The Octal Number is : "+octal);
+		int pow = 0;
+		int decimal = 0;
 		
+		while(octal > 0){
+			int unitDigit = octal % 10;
+			decimal = (int) (decimal + (unitDigit*Math.pow(8, pow)));
+			pow++;
+			octal = octal / 10;
+		}
+		System.out.println("The Decimal Value is : "+decimal);
 	}
 }
 /*
 	OUTPUT
+
+	The Octal Number is : 123
+	The Decimal Value is : 83
+
+	The Octal Number is : 144
+	The Decimal Value is : 100
+	
+	The Octal Number is : 1000
+	The Decimal Value is : 512
 */
diff --git a/InterviewPrograms/src/com/java/strings/CountVowels.java b/InterviewPrograms/src/com/java/strings/CountVowels.java
@@ -28,7 +28,7 @@
  * 
  * Words without vowels are
  * sky, spy, try, fly, lynch, myth, dry, why, sync, shy, ply, 
- * by, cry, crypt, fry, gym, psych, 
+ * by, cry, crypt, fry, gym, psych, spy
  */
 
 public class CountVowels {

Original file line number	Diff line number	Diff line change
`@@ -28,7 +28,7 @@`
`28`	`28`	`*`
`29`	`29`	`* Words without vowels are`
`30`	`30`	`* sky, spy, try, fly, lynch, myth, dry, why, sync, shy, ply,`
`31`		`- * by, cry, crypt, fry, gym, psych,`
	`31`	`+ * by, cry, crypt, fry, gym, psych, spy`
`32`	`32`	`*/`
`33`	`33`
`34`	`34`	`public class CountVowels {`