C语言趣味程序百例精解之JAVA实现(83)：卡布列克常数

C语言趣味程序百例精解之JAVA实现：



public class Test83{
public static void main(String args[]){
new Test83(). KaBuLieKe83(4321,0);
}

/**
* 83。卡布列克常数，挺好玩，实现一下
*/
public void KaBuLieKe83(int n, int count) {
int cha = getTheMaxOrMin(n, 1) - getTheMaxOrMin(n, 0);
System.out.println(count + ":" + getTheMaxOrMin(n, 1) + "-"
+ getTheMaxOrMin(n, 0) + " = " + cha);
count++;
if (n == 6174) {
System.out.println("I did it 6174");
} else {
KaBuLieKe83(cha, count);
}
}

/**
* 获取重新排列后最大的数，如2310,得到3210，暂时只要四位
*/
public int getTheMaxOrMin(int n, int maxOrMin) {
if (n < 1000 || n > 9999)
return -1;
int a = getThe(n, 4);
int b = getThe(n, 3);
int c = getThe(n, 2);
int d = getThe(n, 1);

int temp = 0;
int[] list = new int[] { a, b, c, d };
for (int i = 0; i < 4; i++) {
for (int j = i; j < 4; j++) {
if (maxOrMin == 1 ? (list < list[j]) : (list > list[j])) {
temp = list;
list = list[j];
list[j] = temp;
}
}
}
return list[0] * 1000 + list[1] * 100 + list[2] * 10 + list[3];
}
/**
* 获取N右数第i位
*/
public int getThe(int num, int i) {
if (i > getBitCount(num) || i < 1)
return -1;
return (num % ((int) Math.pow(10, i))) / (int) Math.pow(10, i - 1);
}

/**
* 获取一个数的位数
*/
public int getBitCount(int n) {
int i = 1;
while (n / 10 > 0) {
i++;
n /= 10;
}
return i;
}
}
C:\bat>java Test83
0:4321-1234 = 3087
1:8730-378 = 8352
2:8532-2358 = 6174
3:7641-1467 = 6174
I did it 6174

转载自：http://www.javaxxz.com/read.php?tid=2070