Java lang Long.toOctalString() Method with Examples Last Updated : 19 Nov, 2020 Comments Improve Suggest changes Like Article Like Report The Java.lang.Long.toOctalString() function is a built-in function in Java that returns a string representation of the long argument as an unsigned integer in base 8. Syntax: public static int toOctalString(long num) Parameters: The function accepts a single mandatory parameter num, which is to be converted to a string. The parameter is of long data-type. Returns: The function returns a string representation of the long argument as an unsigned integer in base 8. Examples: Input : 16 Output : 20 Input : 1234 Output : 2322 Program to demonstrate the working of function: Java // Java program to demonstrate working // of java.lang.Long.toOctalString() method import java.lang.Math; class Gfg1 { // driver code public static void main(String args[]) { long l = 16; // returns the string representation of the unsigned int value // represented by the argument in octal (base 8) System.out.println("Octal string is " + Long.toOctalString(l)); l = 1234; System.out.println("Octal string is " + Long.toOctalString(l)); } } Output: Octal string is 20 Octal string is 2322 Program 2: The program below demonstrates the working function when a negative number is passed. Java // Java program to demonstrate // of java.lang.Long.toOctalString() method // negative number import java.lang.Math; class Gfg1 { // driver code public static void main(String args[]) { // when negative number is passed System.out.println("Hex is " + Long.toOctalString(-14)); } } Output: Hex is 1777777777777777777762 Errors and Exception: Whenever a decimal number or a string is passed as an argument, it returns an error message which says "incompatible types". Program 3: The program below demonstrates the working function when a string number is passed. Java // Java program to demonstrate // of java.lang.Long.toOctalString() method // string number import java.lang.Math; class Gfg1 { // driver code public static void main(String args[]) { // when string number is passed System.out.println("Hex is " + Long.toOctalString("14")); } } Output: prog.java:13: error: incompatible types: String cannot be converted to long System.out.println("Hex is " + Long.toOctalString("14")); Program 4: The program below demonstrates the working function when a decimal is passed. Java // Java program to demonstrate // of java.lang.Long.toOctalString() method // decimal number import java.lang.Math; class Gfg1 { // driver code public static void main(String args[]) { // when decimal number is passed System.out.println("Hex is " + Long.toOctalString(15.67)); } } Output: prog.java:13: error: incompatible types: possible lossy conversion from double to long System.out.println("Hex is " + Long.toOctalString(15.67)); Comment More infoAdvertise with us Next Article Java lang Long.toOctalString() Method with Examples gopaldave Follow Improve Article Tags : Misc Java Java-lang package Java-Functions java-math java-Long +2 More Practice Tags : JavaMisc Similar Reads Java Tutorial Java is a high-level, object-oriented programming language used to build web apps, mobile applications, and enterprise software systems. 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