Java程序将八进制转换为十进制

编写一个 Java 程序，将八进制转换为十进制。在此八进制到十进制转换程序示例中，我们将使用 Integer.parseInt() 方法，并将八进制字符串作为第一个参数，八进制基数 8 作为第二个参数。

package Remaining;

public class OctalToDecimal1 {
	
	public static void main(String[] args) {
		
		String s1 = "10";
		String s2 = "67";
		String s3 = "125";
		String s4 = "142";
		
		System.out.println(Integer.parseInt(s1, 8));
		System.out.println(Integer.parseInt(s2, 8));
		System.out.println(Integer.parseInt(s3, 8));
		System.out.println(Integer.parseInt(s4, 8));
	}
}

8
55
85
98

使用 parseInt 的 Java 程序将八进制转换为十进制

此示例接受八进制字符串，并使用 parseInt() 函数将其转换为十进制数。

package Remaining;

import java.util.Scanner;

public class OctalToDecimal2 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		sc= new Scanner(System.in);

		System.out.print("Please Enter Octal Number =  ");
		String octalString = sc.nextLine();
	
		int decimalVal = Integer.parseInt(octalString, 8);
		System.out.println("Octal To Decimal Result = " + decimalVal);
	}
}

此程序使用 while 循环帮助将八进制转换为十进制。

package Remaining;

import java.util.Scanner;

public class OctalToDecimal3 {
	private static Scanner sc;
	
	public static void main(String[] args) {

		int  octalVal, temp, remainder, decimal = 0, n = 0;
		sc= new Scanner(System.in);

		System.out.print("Please Enter Number =  ");
		octalVal = sc.nextInt();
		
		temp = octalVal;
		while(temp > 0)
		{
			remainder = temp % 10;
			decimal = (int) (decimal + remainder * Math.pow(8, n));
			temp = temp / 10;
			n++;
		}

		System.out.println(octalVal + " Result = " + decimal);
	}
}

Please Enter Number =  128
128 Result = 88

此程序将使用函数将八进制转换为十进制。

package Remaining;

import java.util.Scanner;

public class OctalToDecimal4 {
	private static Scanner sc;
	
	public static void main(String[] args) {

		sc= new Scanner(System.in);

		System.out.print("Please Enter Octal Number =  ");
		int octalVal = sc.nextInt();
		
		int decimal = octalToDecimal(octalVal);

		System.out.println("Decimal Result = " + decimal);
	}
	
	public static int octalToDecimal(int octalVal)
	{
		int decimal = 0, i = 0;
		
		while(octalVal != 0)
		{
			decimal = (int) (decimal + (octalVal % 10) * Math.pow(8,  i++));
			octalVal = octalVal / 10;
		}
		return decimal;
	}
}

Please Enter Octal Number =  1129
Decimal Result = 601