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import java.util.Scanner;
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public class computer {
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// 将任意进制数转换为十进制数
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public static int toDecimal(String number, int base) {
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int decimal = 0;
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int power = 0;
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// 从字符串的末尾开始遍历
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for (int i = number.length() - 1; i >= 0; i--) {
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char digit = number.charAt(i);
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int value;
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// 处理0-9的数字字符
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if (digit >= '0' && digit <= '9') {
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value = digit - '0';
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}
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// 处理A-F（或a-f）的十六进制字符
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else if (digit >= 'A' && digit <= 'F') {
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value = digit - 'A' + 10;
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} else if (digit >= 'a' && digit <= 'f') {
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value = digit - 'a' + 10;
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} else {
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throw new IllegalArgumentException("Invalid character in number: " + digit);
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}
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// 根据当前字符的权重（即它在数中的位置）累加其值
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decimal += value * Math.pow(base, power);
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power++;
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}
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return decimal;
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}
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// 将十进制数转换为任意进制数
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public static String fromDecimal(int decimal, int base) {
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if (base < 2 || base > 16) {
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throw new IllegalArgumentException("Base must be between 2 and 16");
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}
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StringBuilder number = new StringBuilder();
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// 当十进制数大于0时，持续转换
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while (decimal > 0) {
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int remainder = decimal % base;
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char digit;
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// 处理0-9
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if (remainder < 10) {
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digit = (char) ('0' + remainder);
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}
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// 处理10-15（A-F）
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else {
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digit = (char) ('A' + (remainder - 10));
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}
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number.insert(0, digit); // 在字符串的开头插入新的字符
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decimal /= base; // 更新十进制数，去掉已转换的部分
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}
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// 如果转换后的字符串为空（即输入的十进制数为0），则返回"0"
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return number.length() == 0 ? "0" : number.toString();
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}
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public static void main(String[] args) {
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Scanner scanner = new Scanner(System.in);
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// 输入原始进制数和目标进制
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System.out.print("输入原始数字的基数（2-16）: ");
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int originalBase = scanner.nextInt();
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System.out.print("输入原始数字输入要转换的基数（2-16）: ");
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String originalNumber = scanner.next();
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System.out.print("输入要转换的基数（2-16）: ");
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int targetBase = scanner.nextInt();
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// 转换并输出结果
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int decimal = toDecimal(originalNumber, originalBase);
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String convertedNumber = fromDecimal(decimal, targetBase);
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System.out.println("转换后的号码是: " + convertedNumber);
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scanner.close();
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}
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} |
