|
|
import java.util.Scanner;
|
|
|
|
|
|
public class uml10_10 {
|
|
|
|
|
|
// 将任意进制字符串转换为十进制整数
|
|
|
public static int toDecimal(String number, int base) {
|
|
|
int decimal = 0;
|
|
|
int power = 0;
|
|
|
//还好还好
|
|
|
// 从字符串的末尾开始处理
|
|
|
for (int i = number.length() - 1; i >= 0; i--) {
|
|
|
char digit = number.charAt(i);
|
|
|
|
|
|
// 如果是数字字符（0-9）
|
|
|
if (Character.isDigit(digit)) {
|
|
|
int value = Character.getNumericValue(digit);
|
|
|
decimal += value * Math.pow(base, power);
|
|
|
}
|
|
|
// 如果是字母字符（A-F 或 a-f），表示10-15
|
|
|
else if (Character.isLetter(digit)) {
|
|
|
char upperDigit = Character.toUpperCase(digit);
|
|
|
int value = upperDigit - 'A' + 10;
|
|
|
decimal += value * Math.pow(base, power);
|
|
|
} else {
|
|
|
throw new IllegalArgumentException("Invalid character in number: " + digit);
|
|
|
}
|
|
|
|
|
|
power++;
|
|
|
}
|
|
|
|
|
|
return decimal;
|
|
|
}
|
|
|
|
|
|
// 将十进制整数转换为任意进制字符串
|
|
|
public static String fromDecimal(int number, int base) {
|
|
|
if (number == 0) {
|
|
|
return "0";
|
|
|
}
|
|
|
|
|
|
StringBuilder result = new StringBuilder();
|
|
|
char[] digits = "0123456789ABCDEF".toCharArray(); // 支持到16进制
|
|
|
|
|
|
boolean isNegative = number < 0;
|
|
|
if (isNegative) {
|
|
|
number = -number;
|
|
|
}
|
|
|
|
|
|
while (number > 0) {
|
|
|
int remainder = number % base;
|
|
|
result.insert(0, digits[remainder]);
|
|
|
number /= base;
|
|
|
}
|
|
|
|
|
|
if (isNegative) {
|
|
|
result.insert(0, '-');
|
|
|
}
|
|
|
|
|
|
return result.toString();
|
|
|
}
|
|
|
|
|
|
public static void main(String[] args) {
|
|
|
Scanner scanner = new Scanner(System.in);
|
|
|
|
|
|
System.out.print("请输入源进制（2-16）：");
|
|
|
int sourceBase = scanner.nextInt();
|
|
|
scanner.nextLine(); // 消耗掉换行符
|
|
|
|
|
|
System.out.print("请输入目标进制（2-16）：");
|
|
|
int targetBase = scanner.nextInt();
|
|
|
scanner.nextLine(); // 消耗掉换行符
|
|
|
|
|
|
System.out.print("请输入要转换的" + sourceBase + "进制数字：");
|
|
|
String number = scanner.nextLine().trim(); // 读取实际的数字输入
|
|
|
|
|
|
// 验证源进制数字是否有效
|
|
|
for (char c : number.toCharArray()) {
|
|
|
if (!Character.isDigit(c) && !(Character.isLetter(c) && (Character.toUpperCase(c) >= 'A' && Character.toUpperCase(c) <= 'F') && sourceBase > 10)) {
|
|
|
throw new IllegalArgumentException("Invalid character in source base number: " + c);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// 将源进制数字转换为十进制
|
|
|
int decimalNumber = toDecimal(number, sourceBase);
|
|
|
|
|
|
// 将十进制数字转换为目标进制
|
|
|
String convertedNumber = fromDecimal(decimalNumber, targetBase);
|
|
|
|
|
|
System.out.println("转换后的" + targetBase + "进制数字是：" + convertedNumber);
|
|
|
|
|
|
scanner.close();
|
|
|
}
|
|
|
} |
