将八进制转换为二进制的 Java 程序
给定一个八进制数作为输入，任务是将该数转换成它的二进制等价数。
示例:
Input: Octal Number = 513
Output: Binary equivalent value is: 101001011
Explanation :
Binary equivalent value of 5: 101
Binary equivalent value of 1: 001
Binary equivalent value of 3: 011
八进制数字系统:
八进制数字系统是以 8 为基数的位置数字系统，使用八个不同的数字 0 到 7。
二进制数系统:
二进制数是用基数为 2 的二进制数字系统表示的数，它只使用两个符号:0 和 1。
八进制到二进制转换表:
| 八进制的 | 二进制的 | | --- | --- | | Zero | 000 | | one | 001 | | Two | 010 | | three | 011 | | four | One hundred | | five | One hundred and one | | six | One hundred and ten | | seven | One hundred and eleven |方法 1:天真方法
在这种方法中，八进制数的输入将被视为一个字符串。此外，完整的字符串将一个字符一个字符地迭代，并为每个字符(即。，八进制数字)，它的等价二进制值根据上面的八进制到二进制转换表将被求值。每次迭代的结果将被添加到结果字符串中，所有值的组合将给出所需的二进制数。下面是这个方法的实现。
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to convert
// Octal number to Binary
class OctalToBinary {
// function to convert octal number
// to its binary equivalent value
static String converter(String octalValue)
{
// integer variable to iterate
// the input octal string
int i = 0;
// string to store the result
String binaryValue = "";
// iterating the complete length
// of octal string and assigning
// the equivalent binary value
// for each octal digit
while (i < octalValue.length()) {
// storing character according
// to the number of iteration
char c = octalValue.charAt((int)i);
// switch case to check all
// possible 8 conditions
switch (c) {
case '0':
binaryValue += "000";
break;
case '1':
binaryValue += "001";
break;
case '2':
binaryValue += "010";
break;
case '3':
binaryValue += "011";
break;
case '4':
binaryValue += "100";
break;
case '5':
binaryValue += "101";
break;
case '6':
binaryValue += "110";
break;
case '7':
binaryValue += "111";
break;
default:
System.out.println(
"\nInvalid Octal Digit "
+ octalValue.charAt((int)i));
break;
}
i++;
}
// returning the final result
return binaryValue;
}
// Driver code
public static void main(String args[])
{
System.out.println("Octal to Binary Conversion\n");
// octal number which is to be converted
String octalNumber = "315";
System.out.println("Octal number: " + octalNumber);
// calling the converter method and
// storing the result in a string variable
String result = converter(octalNumber);
System.out.println("Binary equivalent value is: "
+ result);
}
}
Output
Octal to Binary Conversion
Octal number: 315
Binary equivalent value is: 011001101
方法二:数学方法
这种方法包括完整的数学计算，以获得所需的结果。八进制数的输入将被视为整数。此外，首先将其转换为十进制等值，然后使用数学运算将其从十进制数转换为二进制等值。下面是这个方法的实现。
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to convert
// Octal number to Binary
public class OctalToBinary {
// function to convert octal number
// to its binary equivalent value
public static int converter(int octalValue)
{
// declaring all variable
// to store the intermediate results
int i = 0;
int decimalValue = 0;
int binaryValue = 0;
// converting octal number
// into its decimal equivalent
while (octalValue != 0) {
decimalValue
+= (octalValue % 10) * Math.pow(8, i);
++i;
octalValue /= 10;
}
i = 1;
// converting generated decimal number
// to its binary equivalent
while (decimalValue != 0) {
binaryValue += (decimalValue % 2) * i;
decimalValue /= 2;
i *= 10;
}
// returning the final result
return binaryValue;
}
// Driver code
public static void main(String[] args)
{
System.out.println("Octal to Binary Conversion\n");
// octal number which is to be converted
int octalNumber = 315;
System.out.println("Octal number: " + octalNumber);
// calling the converter method and
// storing the result in a string variable
int result = converter(octalNumber);
// printing the binary equivalent value
System.out.println("Binary equivalent value is: "
+ result);
}
}
Output
Octal to Binary Conversion
Octal number: 315
Binary equivalent value is: 11001101
方法 3:使用内置的 java 方法
integer . parsent()是 Java 中的内置函数，用于将字符串解析为由基数值(方法的第二个参数)指定的数字系统。在这种方法中，八进制数的输入将被视为字符串。八进制字符串将被解析为八进制的整数值。此外，八进制数将使用另一种内置方法将其转换为等效的二进制数。结果值也将是字符串数据类型。下面是实现。
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to convert
// Octal number to Binary
class OctalToBinary {
// function to convert octal number
// to its binary equivalent value
public static String converter(String octalValue)
{
// parsing the string value
// by following octal number system
int octal = Integer.parseInt(octalValue, 8);
// converting octal number to binary
// and storing as a string
String binaryValue = Integer.toBinaryString(octal);
// returning the resultant string
return binaryValue;
}
// Driver code
public static void main(String args[])
{
System.out.println("Octal to Binary Conversion\n");
// octal number which is to be converted
String octalNumber = "315";
System.out.println("Octal number: " + octalNumber);
// calling the converter method and
// storing the result in a string variable
String result = converter(octalNumber);
// printing the binary equivalent value
System.out.println("Binary equivalent value is: "
+ result);
}
}
Output
Octal to Binary Conversion
Octal number: 315
Binary equivalent value is: 11001101
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