Octal number format - Java Language Basics

Java examples for Language Basics:int

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Introduction

When an integer literal starts with a zero and has at least two digits, it is considered to be in the octal number format.

The following line of code assigns a decimal value of 17 (021 in octal) to num: 

// 021 is in octal number format, not in decimal 
int num = 021;

The following two lines assign a value of 17 to the variable num1: 

// No leading zero - decimal number format 
int num1 = 17; 
// Leading zero - octal number format. 
// 021 in octal is the same as 17 in decimal 
int num1 = 021;

An int literal in octal format must have at least two digits, and must start with a zero.

The number 0 is zero in decimal number format, and 00 is zero in octal number format. 

// Assigns zero to num1, 0 is in the decimal number format 
int num1 = 0; 
// Assigns zero to num1, 00 is in the octal number format 
int num1 = 00;

0 and 00 represent the same value, zero.

All int literals in the hexadecimal number format start with 0x or 0X and they must contain at least one hexadecimal digit.


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