Octal is the base-8 number system and uses the digits 0 to 7 in operation. Octal is widely used in computing on systems like the PDP-8, and IBM mainframes employed 12-bit, 24-bit or 36-bit words.
The Java.lang.Integer.toOctalString() method is a built-in function in Java that is used to return a string representation of the integer argument as an unsigned integer in base 8.
Syntax:
public static String toOctalString(int num)
Parameters : The method accepts a single parameter num of integer type which is required to be converted to a string.
Return Value: The function returns a string representation of the integer argument as an unsigned integer in base 8.
Examples:
Consider an integer a = 86 Octal output = 126 Consider an integer a = 186 Octal output = 272
Below programs illustrate the working of Integer.toOctalString() method:
Program 1: For positive integer:
Java
// Java program to demonstrate working// of Integer.toOctalString() methodimport java.lang.*;public class Geeks { public static void main(String[] args) { int a = 527; System.out.println("Integral Number = " + a); // returns the string representation of the unsigned int value // represented by the argument in octal (base 8) System.out.println("Octal Number = " + Integer.toOctalString(a)); }} |
Integral Number = 527 Octal Number = 1017
Program 2: For Negative integer:
Java
// Java program to demonstrate working// of Integer.toOctalString() methodimport java.lang.*;public class Geeks { public static void main(String[] args) { int a = -51; System.out.println("Integral Number = " + a); // Returns the string representation of the unsigned int value // in octal (base 8) System.out.println("Octal Number = " + Integer.toOctalString(a)); }} |
Integral Number = -51 Octal Number = 37777777715
Program 3: For decimal value or a string:
Note: Whenever a decimal number or a string is passed as an argument, it returns an error message which results incompatible types.
Java
// Java program to demonstrate working// of Integer.toOctalString() methodimport java.lang.*;public class Geeks { public static void main(String[] args) { double a = 18.71; // Returns the string representation of the unsigned int value // in octal (base 8) System.out.println("Octal output = " + Integer.toOctalString(a)); String b = "63"; // Returns the string representation of the unsigned int value // in octal (base 8) System.out.println("Octal output = " + Integer.toOctalString(a)); }} |
Output:
prog.java:15: error: incompatible types: possible lossy conversion from double to int
System.out.println("Octal output = " + Integer.toOctalString(a));
^
prog.java:21: error: incompatible types: possible lossy conversion from double to int
System.out.println("Octal output = " + Integer.toOctalString(a));
^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
2 errors
