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Print an Integer (Entered by the User)Add Two IntegersMultiply two Floating Point NumbersFind ASCII value of a characterCompute Quotient and RemainderSwap Two NumbersCheck Whether a Number is Even or OddFind the Frequency of Character in a StringRemove All Whitespaces from a StringRound a Number to n Decimal PlacesDecision Making and Loop
Check Whether an Alphabet is Vowel or ConsonantFind the Largest Among Three NumbersFind all Roots of a Quadratic EquationCheck Leap YearCheck Whether a Number is Positive or NegativeCheck Whether a Character is Alphabet or NotCalculate the Sum of Natural NumbersFind Factorial of a NumberGenerate Multiplication TableDisplay Fibonacci SeriesFind GCD of two NumbersFind LCM of two NumbersDisplay Characters from A to Z using loopCount Number of Digits in an IntegerReverse a NumberCalculate the Power of a NumberCheck Whether a Number is Palindrome or NotCheck Whether a Number is Prime or NotDisplay Prime Numbers Between Two IntervalsCheck Armstrong NumberDisplay Armstrong Number Between Two IntervalsDisplay Factors of a NumberMake a Simple Calculator Using switch...caseCount the Number of Vowels and Consonants in a SentenceSort Elements in Lexicographical Order (Dictionary Order)Create Pyramid and PatternFunctions
Display Prime Numbers Between Intervals Using FunctionDisplay Armstrong Numbers Between Intervals Using FunctionCheck Whether a Number can be Expressed as Sum of Two Prime NumbersFind the Sum of Natural Numbers using RecursionFind Factorial of a Number Using RecursionFind G.C.D Using RecursionConvert Binary Number to Decimal and vice-versaConvert Octal Number to Decimal and vice-versaConvert Binary Number to Octal and vice-versaReverse a Sentence Using Recursioncalculate the power using recursionArrays
Calculate Average Using ArraysFind Largest Element in an ArrayCalculate Standard DeviationAdd Two Matrix Using Multi-dimensional ArraysMultiply to Matrix Using Multi-dimensional ArraysMultiply two Matrices by Passing Matrix to a FunctionFind Transpose of a MatrixPrint an ArrayConcatenate Two ArraysConvert Character to String and Vice-VersaCheck if An Array Contains a Given ValueCollections
Join Two ListsConvert List (ArrayList) to Array and Vice-VersaConvert Map (HashMap) to ListConvert Array to Set (HashSet) and Vice-VersaSort a Map By ValuesObject and Class
Add Two Complex Numbers by Passing Class to a FunctionCalculate Difference Between Two Time PeriodsAdvanced
Convert String to DateGet Current Date/TImeConvert Milliseconds to Minutes and SecondsAdd Two DatesGet Current Working DirectoryConvert Byte Array to HexadecimalCreate String from Contents of a FileAppend Text to an Existing FileConvert a Stack Trace to a StringConvert File to byte array and Vice-VersaConvert InputStream to StringConvert OutputStream to StringLookup enum by String valueCompare StringsSort ArrayList of Custom Objects By PropertyCheck if a String is NumericJava Program to Convert Octal Number to Decimal and vice-versa
To understand this example, you should have the knowledge of the following Java programming topics:
Example 1: Program to Convert Decimal to Octal
public class DecimalOctal {
public static void main(String[] args) {
int decimal = 78;
int octal = convertDecimalToOctal(decimal);
System.out.printf("%d in decimal = %d in octal", decimal, octal);
}
public static int convertDecimalToOctal(int decimal)
{
int octalNumber = 0, i = 1;
while (decimal != 0)
{
octalNumber += (decimal % 8) * i;
decimal /= 8;
i *= 10;
}
return octalNumber;
}
}
Output
78 in decimal = 116 in octal
This conversion takes place as:
8 | 78
8 | 9 -- 6
8 | 1 -- 1
8 | 0 -- 1
(116)
Example 2: Program to Convert Octal to Decimal
public class OctalDecimal {
public static void main(String[] args) {
int octal = 116;
int decimal = convertOctalToDecimal(octal);
System.out.printf("%d in octal = %d in decimal", octal, decimal);
}
public static int convertOctalToDecimal(int octal)
{
int decimalNumber = 0, i = 0;
while(octal != 0)
{
decimalNumber += (octal % 10) * Math.pow(8, i);
++i;
octal/=10;
}
return decimalNumber;
}
}
Output
116 in octal = 78 in decimal
This conversion takes place as:
1 * 82 + 1 * 81 + 6 * 80 = 78
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