题解 | #进制转换#
进制转换
https://www.nowcoder.com/practice/8f3df50d2b9043208c5eed283d1d4da6
import java.util.Scanner; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String num16 = scanner.next(); String[] array =new String[num16.length()]; for (int i = 0; i < array.length; i++) { array[i]= String.valueOf(num16.charAt(i)); } int sum = 0; for (int i = 2; i < array.length; i++) { if (array[i].equalsIgnoreCase("a")){ sum= (int) (sum+10*Math.pow(16.,array.length-i-1)); } else if (array[i].equalsIgnoreCase("b")){ sum= (int) (sum+11*Math.pow(16.,array.length-i-1)); } else if (array[i].equalsIgnoreCase("c")){ sum= (int) (sum+12*Math.pow(16.,array.length-i-1)); } else if (array[i].equalsIgnoreCase("d")){ sum= (int) (sum+13*Math.pow(16.,array.length-i-1)); } else if (array[i].equalsIgnoreCase("e")){ sum= (int) (sum+14*Math.pow(16.,array.length-i-1)); } else if (array[i].equalsIgnoreCase("f")){ sum= (int) (sum+15*Math.pow(16.,array.length-i-1)); } else { sum= (int) (sum+Integer.parseInt(array[i])*Math.pow(16.,array.length-i-1)); } } System.out.println(sum); } }