Java如何將十六進制數轉換為十進制數的程序
阿新 • • 發佈:2017-10-06
swift int i++ 進制數 pub 原理 lin uppercase enter
package com.swift; import java.util.Scanner; public class Hex2Decimal { public static void main(String[] args) { Scanner scan = new Scanner(System.in); System.out.println("please enter a Hex:"); String hex = scan.nextLine(); hex = hex.toUpperCase(); System.out.println("The hex is:" + hex); int decimal = 0; for (int i = 0; i < hex.length(); i++) { if (hexChar2Decimal(hex.charAt(hex.length() - 1 - i)) != -1) { decimal = (int) (decimal + hexChar2Decimal(hex.charAt(hex.length() - 1 - i)) * Math.pow(16, i)); } else{ System.out.println("enter error, decimal will be zero!"); break; } } System.out.println("decimal=" + decimal); } private static int hexChar2Decimal(char charAt) { if (charAt >= ‘A‘ && charAt <= ‘F‘)return charAt - ‘A‘ + 10; else if (charAt >= ‘0‘ && charAt <= ‘9‘) return charAt-‘0‘; else return -1; } }
十六進制數AF3轉換原理:3*16^0+F*16^1+A*16^2 其中^表示冪運算,F和A需轉換成十進制數15和10
Java如何將十六進制數轉換為十進制數的程序