import java.util.Scanner;/** *将十进制转换为十六进制 */
public class Exercise8_9 { public static void main(String[] args){ System.out.println("请输入十进制数字:"); Scanner sc = new Scanner(System.in); int i = sc.nextInt(); String s = convert_StringBuffer(i); System.out.println("对应的十六进制数为：" + s); } //此方法使用StringBuffer把String保存下的十六进制数倒序输出 public static String convert_StringBuffer(int i){ int num; String s; StringBuffer sb = new StringBuffer(); while(true){ num = i % 16; i /= 16; if(num >= 10){ sb.append(match(num)); }else{ sb.append(num); } if(i <= 16){ if(i >= 10){ sb.append(match(i)); }else{ sb.append(i); } //把s倒序后赋值给new_s sb = sb.reverse(); s =sb.toString(); break; } } return s; } //此方法不使用StringBuffer public static String convert(int i){ String s = ""; String new_s = ""; int num = 0; //通过取余运算和除法运算，把结果赋值给s while(true){ num = i % 16; i /= 16; if(num >= 10){ s += match(num); }else{ s += num; } if(i <= 16){ if(i >= 10){ s += match(i); }else{ s += i; } //把s倒序后赋值给new_s for(int j = s.length() - 1; j >= 0; j--){ new_s += s.charAt(j); } break; } } return new_s; } //功能是把10-15的数转化为十六进制的对应数 public static String match(int i){ String s = ""; switch (i){ case 10: s = "A"; break; case 11: s = "B"; break; case 12: s = "C"; break; case 13: s = "D"; break; case 14: s = "E"; break; case 15: s = "F"; break; } return s; }}
