Java convert octal to decimal

Today we are going to learn java convert octal to decimal. In java, to convert octal to decimal parseInt() method of Integer class is used,

public static int parseInt(String s, int radix) throws NumberFormatException

parseInt() method returns the integer represented by the string argument in the specified radix.

Also read – merge sort in java

However, if the String does not contain a parsable int NumberFormatException is thrown. Here’s java program to convert octal number to decimal,

public class OctalToDecimalDemo
{
public static void main(String[] args)
{
String strOctal = "141";
// converting octal to decimal using Integer.parseInt
int decimal = Integer.parseInt(strOctal, 8);
System.out.println(decimal);
}
}

Output: Meanwhile let’s see program for octal to decimal conversion using method. Here’s the code,

public class OctalCode
{
public static int octalToDecimal(int octalNumber)
{
int decimal = 0;
int num = 0;
while(true)
{
if(octalNumber == 0)
{
break;
}
else
{
int temp = octalNumber % 10;
decimal += temp * Math.pow(8, num);
octalNumber = octalNumber / 10;
num++;
}
}
return decimal;
}

public static void main(String[] args)
{
System.out.println("141 octal is : " + octalToDecimal(141));
System.out.println("230 octal is : " + octalToDecimal(230));
System.out.println("100 octal is : " + octalToDecimal(100));
}
}

Output:

141 octal is : 97
230 octal is : 152
100 octal is : 64